Tournament bankroll

Hi
I've read lots on ring game bankrolls, e.g. 300 * BB for limit and 500-600 or more * BB for no limit. Is there any similar theory on tournament bankroll:
(a) for single tables;
(b) 2-3 multi table tourneys; and/or
(c) large 200+ player multi table tourneys?

Thanks

Linky <--sorry if this is somewhat rude, but I just think this is the funniest post ever.