I had just lost half my stack the hand before, and on freaking On Game Network it is a pain in the ass to reload, so I didnt have time before this hand. Anyways, on to the hand. Does he look me up with what is obviously an overpair to often for this play to be profitable?

PokerRoom No-Limit Hold'em, $2 BB (10 handed) from (Format: Bet The Pot)

Button ($67.00)
SB ($92.00)
Hero ($48.50)
UTG ($174.20)
UTG+1 ($89.70)
UTG+2 ($92.55)
MP1 ($89.00)
MP2 ($187.70)
MP3 ($42.50)
CO ($44.50)

Preflop: Hero is BB with , .
1 fold, UTG+1 raises to $3, 5 folds, Button calls $3, 1 fold, Hero calls $2.

Flop: ($9.50) , , (3 players)
Hero bets $5, UTG+1 calls $5, Button folds.

Turn: ($19.50) (2 players)
Hero bets $10, UTG+1 calls $10.

River: ($39.50) (2 players)
Hero bets $30.5 (All-In)

What i don't like is that the diamond draw got there on the river so you're ahead of very very few holdings now, esp since he raised in EP so it's unlikely that he has 66-88, maybe 99/TT but any higher PP and he calls and he could have AK/AQ of diamonds to call aswell. I prolly check-fold the river. Bet more on the flop and turn if you're going to take this line with your Jacks and you'll be almost allin by the river anyway.

I don't like 1/2 pot bets. People see them as a sign of weakness and will call more often, leaving you none the wiser.

Make it more like 3/4 pot on flop and turn.