SERIAL SITES:

The Serial Squadron This is the most important serial fan site on the Internet. Tons of info on the serials you love. The discussion board is a great place to connect with other serial enthusiasts.
The Serial Experience Fantastic reviews of all the greatest serials from expert, Todd Gault.
Dr Hermes Reviews: Cliffhangers Dr. Hermes gives very solid reviews of classic serials.
The Files of Jerry Blake - Serial Star Info If you happen to fall in love with a certain serial star, you'll be able to find out nearly everything about them here.
The Serials My Space Page The site of a gentleman who obviously LOVES the serials!
Serial-Bowl.com Want to see a certain serial that you just can't seem to get your hands on anywhere else? You can buy it here. Not exactly legit, but a fantastic resource nevertheless.
PUBLIC DOMAIN SERIAL DOWNLOADS:
Undersea Kingdom
Radar Men From the Moon
Zorro's Fighting Legion
Flash Gordon Conquers the Universe
Dick Tracy
Ace Drummond
The Great Alaskan Mystery
Burn Em' Up Barnes
Adventures of Smilin' Jack
The Phantom Empire
Dead End Kids: Junior G-Men
PULP SITES:

ThePulp.Net This is the 'Internet Movie Database' of the pulp world!
The Pulp Avengers Brian Christopher Misiaszek's fantastic article on pulp heroes! It's geared towards use in role playing games, but it's very accessible reading for anyone interested in learning about all the conventions of the genre.
Coming Attratction - Pulp Information Site All the latest in pulp-related news. Essential for those who want to start collecting.
AdventureHouse.com A place to buy pulp reprints.
SpiderPage Site devoted to vigilante pulp hero, 'The Spider'.
Secret Service Operator #5
G8 and His Battle Aces
Biggles
The Page of Fu Man Chu Some information on the pulps' most sinister villain, Fu Man Chu.
The Avenger Wikipedia Page A bit of info on early pulp hero, 'The Avenger', who is rumoured to be appearing alongside 'The Shadow' and 'Doc Savage' in an upcoming movie, directed by Sam Raimi (Spiderman).
www.stealthskater.com - Doc Savage E-books What a goldmine! You can download all the Doc Savage pulps as ebooks, from this incredible site!
ebooks.blogicalthoughts.com - The Shadow E-books Dozens of Shadow pulp ebooks here!
thepulpreader.blogspot.com
blackmaskmagazine.com
OLD TIME RADIO SITES:

The Shadow Podcast Broadcast of classic episodes of 'The Shadow' (the most popular pulp hero of the 1930s)
Shadow Radio Episodes Several episodes of 'The Shadow' from the 1930s to the 1950s.
Old Time Radio - Many Radio Episodes Many episodes of 'The Shadow'.
Radio Days Many classic radio plays.
Captain Midnight Radio Episodes
Old Time Radio at Archive.org
Old Time Horror Radio
RadioLovers.com
OTR.net - 12,000 Old Time Radio Shows!
BestOTR.com - Amazing portal for Old Time Radio
Old Time Radio Fan
Free Old Time Radio Shows
Relicradio.com
Radioatwar.com
THE MUSIC OF THE ERA: JAZZ & SWING INTERNET RADIO: (sign up for a free 'live365.com' account and listen away!)
The Kingdom of Swing
FM 91.5 Swing Big Band
Yehoodi Radio
Radio Dismuke
Rat Patrol Radio
Swinglover's Lounge
KCIX 1940's Nostalgia
Ralphie's Radio
GENERAL RETRO SITES:

The Nostalgia League A place to reminisce about old time B-Movies, Serials, Radio Shows, Westerns, Comics, etc.
INDIANA JONES SITES:

TheRaider.net The best Indiana Jones site on the net!
Indiana Jones.com The Official Indiana Jones site. A great place to get all the latest infor on the fourth installment of the Indy series.
TheIndyExperience.com As of October 2006, this site is no longer being updated. Its creator is abandoning it to focus on his filmmaking career!:-)
The first 10 minutes of the infamous 'Raiders of the Lost Ark: The Adaptation' on YouTube.
ROCKET MEN SITES:

The Rocket Page Very comprehensive Commando Cody website!
Commando Cody Myspace Page This guy loves the Commando!
The Rocketeer Comic Book Wikipedia Page
The Rocketeer Film Wikipedia Page
The Authorized Dave Stevens Web Site Web Site of the creator of 'The Rocketeer'. Dozens of fantastic drawings from the true master of retro artwork, Dave Stevens.
Downloadable Rocket Ranger Game I haven't tried it, but if you're really interested in playing Cinemawear's old 'Rocket Ranger' computer game, you can apparently download it here.
SHADOW SITES:

Dial B for Burbank's 'The Shadow Knows' documentary You can download an incredible feature-length documentary on the most famous pulp hero of them all, 'The Shadow', here!
The Shadow In Review
The Shadow (1994) Film Wikipedia Page
The Shadow Wikipedia Page
DOC SAVAGE SITES:

the86thFloor This is known as THE site for fans of infamous pulp adventurer, Doc Savage.
Doc Savage's Wikipedia Page
Doc Savage:The Supreme Adventurer
DocSavage.Org This site displays all of the original Doc Savage pulp novels in chronological order.
speculations-in-bronze.blogspot.com
SKY CAPTAIN SITES:

The Official Sky Captain Site
Making of 'Sky Captain' Article Read the story of director, Kerry Conran's epic journey to make the feature film, 'Sky Captain and the World of Tomorrow'.
Sky Captain and the World of Tomorrow Wikipedia Page
PHANTOM SITES:

ChronicleChamber.com - Phantom Fan Site
The Phantom Wikipedia Page
The Phantom (1996) Film Wikipedia Page
MODERN PULP/SERIAL-INSPIRED FILM SITES:

LowryBros.com Home page for the makers of the serial spoof, 'Monarch of the Moon'.
Max Neptune and the Menacing Squid An upcoming feature that's a tribute to Indiana Jones, Flash Gordon and Commando Cody. The trailer's pretty neat!
Captain Midnight and the Secret Squadron Web Site for a Captain Midnight fan film.
MISCELLANEOUS SITES:

Flash Gordon Fan Site
The Crimson Collector
ToyRayGun.com An entire site devoted to the toy ray gun!
All 1940s Superman Cartoons on Vintage ToonCast
7 Episodes of the 1940s Superman
The Mummy (1999) Film Wikipedia Page
The Mummy Returns (2001) Film Wikipedia Page
Star Trek: Voyager - Bride of Chaotica! Wikipedia Page
Dick Tracy (1990) Film Wikipedia Page
Tales of the Gold Monkey Wikipedia Page
The Dirty 30s!, a pulp sourcebook for any RPG based in the 1930s
Alex Ross Art
Athena Voltaire Comics
Tour of the 1939 World's Fair
Zeppelin Vs. Pterodactyls
iwasabronzeageboy.blogspot.com
The Pin-up Page
Tales of the Gold Monkey Fan Site
GoldenAgeComics.co.uk
The Golden Age of Comics Podcast
PULP/SERIAL-RELATED INTERNET VIDEOS:
'Monarch of the Moon' Trailer
'Max Neptune and the Menacing Squid' Trailer
'OXG: The Organization of Extraordinary Gentlemen' Trailer
'Ace Derringer Vs. The Shadowmen'
'Captain Midnight and the Secret Squadron'
'Spy Smasher' on Justice League of America
'Captain Celluloid Vs. The Film Pirates': Chapter 1
'Rocket Ranger' Video Game Played in Full
'Space Knights' - Retro Serial-style Trailer for the 'Star Wars' Prequels
'MYSTERY SQUADRON: Chapter One: The Black Ace Part I'
'ROCKETEER Trailer circa 1938'
'BUCK ROGERS fan film'
'1940s-style Raiders of the Lost Ark trailer'
'Early 1950s-style Raiders of the Lost Ark trailer'