I don't think Sun cheated simply b/c of Locke was able to walk again after they got stranded on the island, then Jin's swimmers finally hit the jackpot.
Good episode. I love Sun & Jin. I was also happy to see Bernard & Rose again. He was so cute trying to find her a pearl. Also, I agree with Kate. Who the hell packs a pregnancy test?
SPOILER ALERT!
I recently found out that the producers have decided to make a background episode for Rose & Bernard.