3d Sites:
Turbo Squid
3D Expose
Highend 3D
Beyond3D
3D Total

Illustration:
GFXARTIST
GutterZombie

General Art:
CG Talk
Deviantart
The Gnomon Workshop
ArtBistro
Wikiversity

Games:
Gamasutra

Freelance:
Ifreelance

Networking:
Linkedin

Printing:
LuLu

Stock images/textures:
stock.xchng
Mayang's Free texture Library
Wikimedia

File sending/sharing:
MailBigFile
Box

Freeware:

Freebye's Free software Links
Apophysis 2.2
Free websites

Most of these sites are free to use. Enjoy!

If you find links to other valueable pages that I can link to, then please share them by emailing me. Thanks!