The Mac sites that keep me awake on nightshifts...

iMacintouch - a really useful site. Worth checking daily.

Apple's iMac support page - but you've been there already, right?

Apple iMac tech exchange - mainly US users, but worth checking out regularly.

MacOS Rumours - worth checking before you shell out on a new Mac.

MacCommunist - part of the Mired network. Foul-mouthed and often hilarious. 'F*** the MacOS', for example, is spot-on. And check out the OS9 poster!