My standard line when heads up is to call down, betting if checked to. Let them keep bluffing with underpairs or AQ.
I wasn't sure how to handle it 3-handed, so I just called down:
Party Poker 2/4 Hold'em (8 handed)
converter
Preflop: Hero is CO with K[img]/images/graemlins/club.gif[/img], 2[img]/images/graemlins/spade.gif[/img].
<font color="#666666">
5 folds</font>, <font color="#CC3333">Hero raises</font>, <font color="#666666">
1 fold</font>, <font color="#CC3333">SB 3-bets</font>, BB calls, Hero calls.
Flop: (9 SB) 7[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.
Turn: (6 BB) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.
River: (9 BB) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets</font>, BB calls, Hero calls.
Final Pot: 12 BB