Hand from 'How Good is your Limit Hold'em'

[fluff]

First of all, fold PF.

Also, this is a clear check-raise situation. Your hand has huge equity (excepting a bigger Q, or an unlikely 44), you have a PF raiser immediately behind you, a huge field behind him you can trap, and your hand is unprotecatble (flush draws are correct to call even if you bet, and BB raises).

If you bet out here, and BB raises, most of the field will fold. This is bad for you. Again, excepting a bigger Q or 44, everyone else will have very few outs. Overcards/face cards (AK, AJo, KTs etc) are drawing pretty much dead, pairs are drawing to 2 outs, only flushes are a threat, drawing to 8 outs, plus you have some outs against those even if they hit). You have big equity, build as big a pot as you can.

If you didn't have a PF raiser to your immediate left, you should probably bet out, not to protect your hand, but for value: we fear that the hand will be checked through. This is especially true if the opponents are passive.