Well, I just executed arbitrage between Stamp and BTC-e. I have 1100$ more now, though most of my fiat is on BTC-e now, not on Stamp. Hopefully, Putin won't killed BTC-e owners now :

nice, I used to to trade LTC there, but it has been 4 months since my last trade there and I don't have balls to go there again, even if the gap between stamp and BTC-e is $40, the risk is not worth it.... just be careful, at least you know who owns stamp and where to get them if anything goes wrong....
Yeah, I know all exchanges are risk but it's a risk I have to make, otherwise I'd still have 8 BTC worth 5k$
Much more, around 70 fold in Bitcoin since end of March 2013. If I would turn all fiat, alts, shares etc in Bitcoins I'd collect over 500 BTC now.