When to take one off on the flop?

Is bottom pair worth taking one off here with a bunch of weak players and no agro on the flop? Late position post, called PFR for one bet with position and a bunch a limpers behind to act preflop...

Party Poker 2.00/4.00 Hold'em <font color="#0000FF">(10 handed)</font> link

Preflop: Hero is CO with 6[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/spade.gif[/img].
<font color="#666666">2 folds</font>, MP1 calls, <font color="#CC3333">MP2 raises</font>, <font color="#666666">1 folds</font>, Hero calls, <font color="#666666">1 folds</font>, SB calls, <font color="#666666">1 folds</font>, MP1 calls.

Flop: (9.00 SB) K[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, MP1 calls, MP2 calls, Hero???