Interestingly, a friend a couple months ago was telling me about ultra ETFs. They use leverage to ensure (quite reliably so far, though they're new) a daily return of double the index they're based on. He specifically recommended one that is short the S&P.
I haven't talked to him since, but I suspect he's buying a beach house ATM.
Yeah, over time an ultra etf should make 2x what the s&p gains (and a short one would lose 2x). In the short term though that's a hell of a profit (on the ultra shorts) when things go the way they have.
Also, we have some people in the know post on the TicketStumber blog:
http://ticketstumbler.com/blog/category/sports-insights/
http://sports.ticketstumbler.com/blog/?cat=4
My gambling "fund" is up 35% for the year. My stocks are down by a similar margin.