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A A against 3 3
The flop was: 2 4 5
In the thread, the guy with As said he had about a 75% chance to win and backed it up with numbers from
http://www.twodimes.net/poker/. But the guy with 3s had only four outs (the sixes, since the other two threes would give As a straight) or he would lose. According to the statistics as above, that means he only had a 16.47% chance to catch a winning card, making the guy with As about a 83% favorite. I say about because I get that if both a 3 and a 6 came then they would tie with a straight to 6.
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Poker Stove says aces are a 75.445% favorite. Calculating showdown %'s can be tricky. At first blush it looks like the 3's have 6 outs to win, making the aces a 75.9% favorite to win.
The reason Poker Stove's answer slightly differs from a simple "outs" answer is because it's considering all of the more complex instances, like where both a 3 and a board pair card will come, giving the aces a straight but a full house to the 3's.
-L