(Alright Strolen, you asked for it.

)
Here cometh a trove of Manfred's wonderfule and noth so wonderfule linkses, leading to all places possible and impossible. Disclaim do I, that dis list is surely not complete, as my memory has more holes than 'Huacan cheese visited by Kalap'lan mouse. Comes yet wyth His Manic Majesty's personnaly lejendary commentary!
For this list I give less guarantee than software-vendors do (ie: none).
Personal Resources (done by individuals or groups)
http://mythmere.tripod.com Mythmere, a wonderfule resource for most things you may seek.
http://hiddenway.tripod.com/ Hiddenway, another great one. Be sure to see the city of Adelfarn.
http://www.agyris.net Agyris world and rich resources
http://www.mythosa.net/ yet another world...
http://www.maranci.net seems boring? Note the RuneQuest pages!
http://members.aol.com/MarkJYoung/ They say this guy is long in the business already... has quite a few good things at hand.(If you can find it.) One place is
http://members.dandy.net/~mjyoung/writings.htm http://www.angelfire.com/ma/rpg/index.html The World of Arumo. An interesting world-building idea. Pop-ups though.
http://www.geocities.com/TimesSquare/Fortress/6394/gallery.html Maelstrom Campaign, another must-see
http://www.ddream.com Place to find traps en-masse.
http://www.io.com/~sjohn/ again, much to find and enjoy
Specialized and advisory resourceshttp://elfwood.lysator.liu.se Elfwood, an excellent place to find pictures and fan fiction.
http://www.burningvoid.com/ Valuable advices for DM's.
http://www.roleplayingtips.com The name says it all. Good, but be warned that it slowly turns commercial.
http://www.geocities.com/TimesSquare/Realm/5037/netbook/table.html DM's Netbook ... bad links there or what?
http://www.gamegrene.com good advice, even Evil GM Tricks, hmmm...
http://www.criticalmiss.com RPGs seen the other way
http://www.irony.com Irony Games. Love them.
Directories (sort of commercial resources)
http://www.rpgarchive.comhttp://www.dndresources.com/http://www.dndadventure.com/index.html...and others.
http://www.fortunecity.com/victorian/byzantium/55/ The Blue Troll, one directory with character
Companies (downright commercial resources, or not quite so)
http://www.basementgames.com See Juravia. Not updated anymore. Freely accessible (requires login though) are many things. d**n, seems they deleted that over 200 brief yet usable rumours, that were there.
Communitieshttp://strolen.com Know this one? A nice one, worth visiting. A d**n good resource, too.
http://www.realmsofevil.net Yeah, liked them for a long time... Things accessible from main page are seldom updated now, most of the activity goes on inside this corpse... which is not truly dead.
http://www.gamingoutpost.com Had lively forums, but now seems to grow dead. I was there for a short time before it turned commercial.