^ how is his king high beating trips on the flop?

Dude, you have to understand something:
You did not have the nut flush draw, anyone with the nut flush draw has you beat.

firewire: raises to $4
DariusK: calls $2.50
fuslowly: raises to $8.50
firewire: raises to $15
DariusK: raises to $31.69 and is all-in
fuslowly: raises to $48.38
firewire: raises to $137.52 and is all-in

This first raise is fine because it's a good opportunity to gain the aggressional position for the turn. Once you are re-raised and re-raised and re-raised however, a trigger in your head should have been set off telling you that someone has hit to flop in a good way.

Pushing All-In is the best way to win a pot. Pushing All-In with the 2nd nut flush against two other players who are obviously in the pot for the long haul is going to loose you money.