I'm getting too aggressive with overcards...

[randomfish]

Check preflop? Where do I slow down?

I recently switched from Prima .25/.5, where people very often call a preflop-raiser down and then fold to a river bet. I had a couple of hands like this one last night and I'm thinking I'm just betting my opponents' hands for them.

Party Poker 0.5/1 Hold'em (9 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is BB with A/images/graemlins/club.gif, Q/images/graemlins/diamond.gif.
UTG calls, UTG+1 calls, <font color="#666666">4 folds</font>, Button calls, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, UTG calls, UTG+1 calls, Button calls.

Flop: (8.50 SB) 6/images/graemlins/club.gif, 3/images/graemlins/diamond.gif, 7/images/graemlins/heart.gif <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, UTG+1 calls, Button calls.

Turn: (6.25 BB) 9/images/graemlins/club.gif <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, UTG+1 folds, Button calls.

River: (9.25 BB) J/images/graemlins/spade.gif <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG folds, Button calls.

Final Pot: 11.25 BB

Results in white below: <font color="#FFFFFF">
Hero has Ac Qd (high card, ace).
Button has Tc 3c (one pair, threes).
Outcome: Button wins 11.25 BB. </font>

[Wario]

After betting the flop and still being up against 3 opponents on the turn I think this is a check/fold.

Your hand is very unlikely the best here and you're not going to pick this pot up with a bluff often enough.

EDIT: Forget to mention do not check preflop. Raise AQo in an unraised pot from any position.

[btspider]

check-fold turn.
don't include the results.

[cold_cash]

Check/call or check/fold the turn, depending on the action.

Your river bet has very little value. A better hand is never folding, and a worse hand is probably never calling.