I know a few of you like a gamble.
I've never really been into betting, but a friend works at a bookies and told me about raceclear:
It's a completely free tipping site. So far I've made 12 bets (all singles), staked 500 points and returned 713 (43%). Obviously this isn't much data and its only from a couple of days, however it seems to be getting more attention on twitter and seeing as it's free and transparent looks quite interesting (not a scam!).
They claimed last year (2013) a return on investment of 14%, and currently for 2014 they're on 38%
Obviously the more accounts you have the better odds you'll get but I've just got ladbrokes and can't be arsed with that.