flop nuts in multi way limped pot, best line? 50NL

[bravos1]

OK.. I was talking to another 2p2er regarding this hand. We're both basically poo-flinging limidonks. I have just started playing NL and have put in about 20K hands of NL over the past 2.5-3 months. PF may be a tad loose, but these guys are just horrible. Anyway, let's takea look...

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 6 Players
LeggoPoker Hand History Converter

Hero (SB): $74
BB: $76.20
UTG: $29.75
MP: $42.35
CO: $54.90
BTN: $93.25

Pre-Flop: 7[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/heart.gif[/img] dealt to Hero (SB)
UTG folds, MP calls $0.50, CO calls $0.50, BTN folds, Hero calls $0.25, BB checks

Flop: ($2) 9[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] (4 Players)
<font color="red">Hero bets $2</font>, BB calls $2, <font color="red">MP raises to $4</font>, CO calls $4, <font color="blue">hero ???</font>

Who raises to what and why? Who calls and why?