A River Dilemma

Well, I see that there are already two river questions on the board today, but I hope no one will mind one more. Can someone give me a line for this river? And maybe the reasoning behind it?

Also, if you'd like to berate me for not raising the flop, I could probably use some of that too.

CO is unkown, SB is 37/4/0.7, and seems fairly fishy.

PokerStars 2/4 Hold'em (6 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img].
UTG calls, MP calls, CO calls, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: (5 SB) J[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(5 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls, UTG folds, MP calls, CO calls.

Turn: (4.50 BB) 7[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, MP folds, CO calls, SB calls.

River: (10.50 BB) A[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, Hero??