Here are a few links to check out for your different needs.

Apple
MobileMe
Mactopia

Jabber Service:
Pufftup (Currently Unavailable...please check back soon)

Forums:

Maclantic (Icelandic)
MacRumors

Mac News:

MacBytes
MacDailyNews
MacWorld
MacLife
MacCompanion
9to5mac

Mac Rumors:

HardMac
AppleInsider

Mac Antivirus:

ClamXav (Free!)
Intego Virus Barrier X5


Mac Desktop backgrounds.

The Apple Collection
Mac Desktops

Mac Gaming:

GameRanger
Aspyr
Macsoft

Mac Hardware:

Apple Service Manuals
Mac Photos (Japanese)

iPod:

iPod Lounge

Web Design/Hosting:

ibdesignstudios
machighway