Turn
 

Button is a TAG. The rest of them suck.

Party Poker 3.00/6.00 Hold'em <font color="#0000FF">(6 handed)</font> link

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP calls, <font color="#666666">1 folds</font>, Button calls, <font color="#CC3333">Hero raises</font>, BB calls, UTG calls, MP calls, Button calls.

Flop: (10.00 SB) 7[img]/images/graemlins/club.gif[/img], K[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls, MP calls, <font color="#CC3333">Button raises</font>, <font color="#CC3333">Hero 3-bets</font>, BB folds, UTG calls, MP calls, <font color="#CC3333">Button caps</font>, Hero calls, UTG calls, MP calls.

Turn: (13.50 BB) 2[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="green"> Hero ..... </font>

Re: Turn
 

It really looks like a set of 7s. I think the correct move would be to check-fold the turn but I can't do that with aces. Also K9s is possible.

Re: Turn
 

Seems like a good time for a turn checkraise, you can fold the river UI if he 3-bets. Or you can call down expecting him to show you K9 or 77, folding whenever you have to call 2.

Re: Turn
 

button probably has you crushed. the only hands that a good player gives you action with on this flop that you beat are a big king and T8. a big king is unlikely given preflop and T8 isn't capping all that often at 3/6.

still, call down. have to see the river because its easy to suck out on two pair, and you have to call the river cause you're getting like seven thousand to one