AQ vs. total weirdness - what's going on here?

[Grendel]

Lately I've been taking a beating so severe I'm not quite sure which way is up. The play of this hand confused me so much that I don't know what's what. Help me, 2+2ers, you're my only hope.

First orbit at table, no real reads.

Party Poker 0.5/1 Hold'em (9 handed) converter

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 calls, <font color="#666666">2 folds</font>, MP3 calls, <font color="#666666">1 fold</font>, Button calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, UTG calls, UTG+1 calls, <font color="#CC3333">MP3 3-bets</font>, Button folds, Hero calls, UTG calls, UTG+1 calls.

Flop: (14 SB) T[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/diamond.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, UTG+1 calls, <font color="#CC3333">MP3 raises</font>, Hero calls, UTG folds, UTG+1 calls.

Turn: (10.50 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, UTG+1 checks, MP3 checks.

River: (10.50 BB) 4[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, UTG+1 folds, <font color="#CC3333">MP3 raises</font>, <font color="#CC3333">Hero...?</font>

Thanks,
-Grendel