BitBet has a prediction market running for one month after the halving
(a bit more interesting as the market will have had time to react to the
actual shrinked supply).

https://bitbet.us/bet/1264/bitcoin-above-600-one-month-after-halving/

BitBet is running a prediction market on this:

https://bitbet.us/bet/1263/bitcoin-halving-to-occur-on-july-9th/

Money weighted odds are currently heavily in favour of July 10th.

FYI, we have a betting pool open on Donald Trump winning the presidential election:

https://bitbet.us/bet/1256/donald-trump-will-win-the-2016-united-states/

1 @ 1.1

Thank you 

And regarding your question:

https://bitbet.us/faq/#1115

If you are interested in theDAO and prediction markets, we have an open bet on the
topic at BitBet :

     https://bitbet.us/bet/1255/thedao-to-be-the-largest-crowdsale-ever/

Enjoy !

The BitBet management team.

 https://bitbet.us/bet/1255/thedao-to-be-the-largest-crowdsale-ever/

Dear BitcoinTalk members,

It is our great pleasure to announce that https://bitbet.us, one of the oldest (since early 2013) and most reliable Bitcoin betting / prediction market site is back online after a short one month hiatus.

The site is operated by a new team, but everything remains otherwise unchanged:
    - fees remain as before (for now), at 1% of amounts wagered
    - creating new bets works as before
    - betting on existing bets works as before
    - policies are as before : https://bitbet.us/faq/

You can get notified of all the new stuff happening on BitBet:
    - Via our twitter feeds https://twitter.com/BitBets and https://twitter.com/BitBetsBets
    - Via our RSS feeds https://bitbet.us/rss/new/ and https://bitbet.us/rss/resolved/

We look forward to seeing you there soon, to bet and to submit exciting bet proposals.

The BitBet management team.