Todd B withdraws all money on the last day of the month, redeposits it on the first day of the month and makes no change to his playing habits (that is, he doesnt ever play just to earn the bonus). That seems like a sound strategy for maximizing the value of the deposit bonus.
And if you don't have a PP account, see the bonus code at bottom right of this site!
Random thoughts from a lawyer, an accountant, a commodities trader, an ex-Marine and a WSOP Main Event money finisher that don't know as much as they wish they did...