well.. i must say my experiment failed )) only one downloaded wallet.dat file so far and I believe this is mpkomara. if this is you please confirm. Next time I will do lottery for much smaller amount of money, so people be more willing to shell out coins =)
It was me. I didn't see any 50-BTC outputs in any blocks in the relevant timespan, and I thought I'd have an advantage in the block rescanning process. I was still surprised to get it, since I noticed this topic 2+ hours after the post.
http://blockexplorer.com/t/phKDn2N55
I broke the coin so other people wouldn't be able to scan the block chain for it as I did
. 50 BTC is a good choice because it is the most common coin size, but next time you might want to avoid specifying the exact amount. 
