3D Buzz	Good forums, friendly community, AWESOME VIDEO TUTORIALS
Unreal Playground	Really nice UT site with reviews, forums, etc
Beyond Unreal	Excellent UT portal
Planet Unreal	Another great UT portal (too many ads, though)
wiki.Beyond Unreal	Learn mapping and mods
Level Designer	Friendly forums and great tutorials; tight group
Game Dev.net	Nice site for game developers. Source, tutorials, theory.
Gamasutra.com	Final destination for the business and theory behind games. Tons of content.

Portals

The CG Channel	High rez, high bandwidth portal for 3d graphics. Updated daily!
3D Gate	3D Design magazine is gone. 3D Gate remains a good destination.
Ultimate 3D Links	Great news and info site.
High End 3D	High rez, high bandwidth portal for 3d graphics.
3D Worxx	Deutsch news and tutorials.

3D Artist	Awesome how-to magazine.
CGI Magazine	CGI Magazine out of the UK with news, tutorials, and reviews.
3D World	3D World magazine out of the UK with news, tutorials, and reviews.
Computer Graphics World	How could you not have heard of CGW mag? Lots of content and news

3D Cafe	Online shopping for 3D artists.
Safe Harbor	Online shopping for 3D artists.
Worley Laboratories	Incredible Lightwave plugins.
MHE.NET	Extremely talented web designers and internet technology developers.

Sound Dogs	Large collection of sound effects for purchase.
Hollywood Edge	Large collection of sound effects for purchase.
Flash Kit	Mostly for flash developers but with lots of content.
License Music	The best place to license music for your next project.

VFX Pro	Feature film visual fx.
Marlin Studios	Top notch textures and awesome gallery.
Exstream	Whoa! Streaming 3D characters over the internet? Nice!

Maps of the Solar System	Real planets from the folks who visit them.
Space Art Wallpaper from Space.com	Not 3D but chock full of good ideas.
Zargon Studios	Phenomenal 3D work by Geoff Holmann.
DotComix.com	Real time(?) character animation on the web. Watch for Mr. Cranky.

Wotsit's File Formats	All the file formats you'll ever need.
Easy 3D	Realtime 3d rendering in Java over the internet. Wait until it matures!
Lead Technologies	Multimedia, imaging, and vector toolkits for Microsoft and Linux.