I don't know how my girlfriend does it, but she does a majority of her computer work in positions I mostly conjugate with images of newborns in a crib or those bed bound in a convalescent home. I might want to get her one of these Lazy Geek's Cushions, though she's hardly lazy or a geek (though she is fond of Star Trek:TNG)...

With 5 adjustable levels, the Lazy Geek's Cushion actually looks ergonomically beneficial. We'd want to cover it with a more attractive slipcover though, as it has a Wal-Mart aesthetic to it that overshadows its utility.