Okay, so the lich king fight makes Marrowgar look like Sindragosa. I got confused reading halfway through most strats. I haven't had time to distil the strats down into specific tips, like Carl's neat boss strat pages, but thought I'd link the stuff I've looked at:
Boss Killers: http://www.bktemp.com/cgi-bin/bbguild/index.cgi?action=view_guide&guide_id=746
Best strat I've read so far.
Tankspot: http://www.tankspot.com/showthread.php?62999-Icecrown-Lich-King
A little confusing.
WoW Wiki: http://www.wowwiki.com/Lich_King_%28Icecrown_Citadel_tactics%29
Good for general information.
Feral Aggression: http://feralaggression.wordpress.com/2010/02/17/so-you-want-to-kill-the-lich-king/
I like this blog. This post has some useful info.
Tremor videos are always good:
Part 1
Part 2
Cheers,
lolz