Playing the gutshot...

[Quercus]

Party Poker 0.5/1 Hold'em (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is CO with K/images/graemlins/diamond.gif, Q/images/graemlins/diamond.gif. MP1 posts a blind of $0.5.
UTG calls, UTG+2 calls, MP1 (poster) checks, MP2 folds, MP3 folds, <font color="CC3333">Hero raises</font>, Button folds, SB folds, BB calls, UTG calls, UTG+2 calls, MP1 calls.

Flop: (10.50 SB) T/images/graemlins/club.gif, 5/images/graemlins/club.gif, A/images/graemlins/diamond.gif <font color="blue">(6 players)</font>
<font color="CC3333">BB bets</font>, UTG folds, UTG+2 calls, MP1 folds, Hero ???.

What do you do here and why?

[topspin]

Raise. You've almost got odds to call just for your non-club J outs, nevermind the J/images/graemlins/club.gif and backdoor flush. Since you're staying in the hand, I like a raise since it may net you a free card on the turn if you need it.