[Exsubmariner]

I use the following rules of thumb:
Limit 500BB
NL 40x max buyin
SNG's buyin = no more than 2% of total role, 1% normally
MTT's - I have heard from several sources that a 5% per buyin of total bankroll is adequate. I don't know though, I don't play MTT's regularly. I have heard they can be exceptionally swingy.

Note my practices concerning bankroll fall into the ultra conservative category.
If tourneys are your thing, you might want to checkout the MTT and SNG forums on the left column just below the banner ad. Your questions may be better answered there.
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