Flopped Str8 - Scary River

I've lurked a bit and grunched a few times. this is my first hand post.

About 20 hands into the the session. UTG, and CO seem Loose & not very aggressive. MP1 is Laggy.

Paradise Poker 0.50/1 Hold'em (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is UTG+1 with T/images/graemlins/spade.gif, 9/images/graemlins/spade.gif.
UTG calls, Hero calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP1 raises</font>, <font color="#666666">1 fold</font>, MP3 calls, CO calls, <font color="#666666">2 folds</font>, BB calls, UTG calls, Hero calls.

Flop: (11.50 SB) 8/images/graemlins/club.gif, 6/images/graemlins/spade.gif, 7/images/graemlins/club.gif <font color="#0000FF">(6 players)</font>
BB checks, <font color="#CC3333">UTG bets</font>, Hero calls, <font color="#CC3333">MP1 raises</font>, MP3 calls, CO calls, UTG calls, <font color="#CC3333">Hero 3-bets</font>, <font color="#CC3333">MP1 caps</font>, (All-In) calls, ($0.75)BB folds, UTG calls, Hero calls.

I didn't raise the UTGs 1st bet because there were 3 behind me and I wanted overcalls. Comments?

Turn: (13.75 BB) 7/images/graemlins/heart.gif <font color="#0000FF">(5 players)</font>
UTG checks, <font color="#CC3333">Hero bets</font>, MP3 folds, CO calls, UTG calls.

River: (16.75 BB) 8/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
UTG checks, Hero ?

Final Pot: 16.75 BB

[WSOP Bound]

I think that the flop call the first time around is okay. I want to try to fold any potential flush draws but can't make it wrong for them to call, so might as well let them help with the pot building. I check this river. Given your previous aggression I don't think you get called here when your ahead. You lose one when your beat, you gain nothing when you are ahead.

I wouldn't have bet the river, 2 pair on the board and you have the UTG sticking with you that boat looks to strong.

Well, Gotta sleep. Thanks for the input.

I did check the river. I think I'm learning - a few weeks ago I'm sure I would have bet.

[Rev. Good Will]

def river check.

flop is awesome btw.