AJ beaten by rivered flush?

PokerStars Game #3122635633: Hold'em No Limit ($0.10/$0.25) - 2005/11/21 - 21:28:22 (ET)
Table 'Kalyke V' Seat #2 is the button
Seat 1: verysneaky5 ($5 in chips)
Seat 2: Boomaker ($18.25 in chips)
Seat 3: albyke ($54.45 in chips)
Seat 4: wing35 ($25 in chips)
Seat 5: woods4life ($10.20 in chips)
Seat 6: ShrimpHouse ($30.50 in chips)
albyke: posts small blind $0.10
wing35: posts big blind $0.25
verysneaky5: posts small & big blinds $0.35
*** HOLE CARDS ***
Dealt to ShrimpHouse [Ac Jh]
woods4life: calls $0.25
ShrimpHouse: calls $0.25
verysneaky5: checks
verysneaky5 said, "c my tourney"
Boomaker: folds
albyke: calls $0.15
wing35: checks
*** FLOP *** [7s Kh 6s]
albyke: checks
wing35: checks
woods4life: checks
ShrimpHouse: checks
verysneaky5: checks
*** TURN *** [7s Kh 6s] [Ad]
albyke: checks
wing35: checks
woods4life: checks
ShrimpHouse: bets $0.75
verysneaky5: folds
albyke: folds
wing35: folds
woods4life: calls $0.75
*** RIVER *** [7s Kh 6s Ad] [3s]
woods4life: bets $5
Shrimphouse: ?

The thing that threw me off was his overbet on the flop of something around 3 dollars. Is he trying to get extra value or is this a bluff?

The reason I didn't open with a raise by the way is that I had recently gone on a rush and wanted to catch my opponents by suprise with this hand.

[amoeba]

most of the time, this is the flush.