I had WoW but have now cancelled my online account through lack of use. As for Xbox Keyboard support look here :-
http://xbox.gamespy.com/articles/565/565000p1.html
And if you're a Phantasy Star Online gamer here:-
http://www.gameseek.co.uk/productdet...w3xmkwb843s87/
I personally think there will be combined PC/Xbox games around once the Xbox360 is released and full supported by the industry.
Surely the specs of the 'dedicated' games console that is Xbox360 is surely tempting PC gamers to give it a thought ? From what I've read in the Xbox forums this seems to be the case.