Reraise with AK?

[Zangief]

If there is a raise in front, is it a profitable move to reraise with AK?

If your answer is "it depends", what if the opponent's raising hands consist of AA, KK, QQ, JJ, AK, and AQ?

[Infamous]

Relative stacks?

You can reraise this with position IMO. If you get called then as a general rule he has an unmade hand - be wary of broadway cards that miss you. If you're reraised, then it's probably a fold - likely you're at best 50-50 and there's no need to take these gambools in ring games.

Don't discount slowplaying if flat called. Although QQ and down shouldn't make this play unless they want to limp for set value with their bad (!) odds.

I'd say it can be profitable but pick your opp well and be willing to relinquish and cut losses. Cont. bet with caution but make sure it's firm if you are going to, possibly take a free turn if you miss and save your bet for then if he's not interested.

Raise / fold > call.

[Bmxicle]

I'm not very consistent, but i'm under the opinion that you can re-raise really aggressive people that raise 10% pfr or more, and you can re-raise tight thinking players who will put you on a big pair. Just make sure not to re-raise the rocks that only raise AA.

Really though it depends. Sometimes its the easiest laydown to a 3xbb raise, sometimes i'll flat call, sometimes i'll re-raise and there even have been a few players i've pushed it allin preflop against.