Some markets I want to trade in but either care about too much or too little to run:

How will the last Harry Potter book end?

Will the last Harry Potter book (or at least its ending) leak before the official release date?

What will the global average surface temperature be in 2020 (or any other year)?

When will [url=http://en.wikipedia.org/wiki/Ratko_Mladic]Ratko Mladic[/url] be indicted by the ICTY or proved dead? This could be a matter of years, but I’ve heard rumors that it’ll be in the next few weeks.

I’ve argued elsewhere that a prediction market in Harry Potter endings doesn’t make much sense, at least not in the real-money prediction market world. Unlike opinions about the winner of the NBA championships, for example, where lots of people have relevant opinions to be captured in a market, only a select “insider” group will have relevant information. Any non-insider is just guessing, and that is not a good investment strategy. (See my post at the prediction market group blog [url=http://www.midasoracle.org/2007/06/09/harry-potter-will-not-die-dont-bet-on-it/]Harry Potter will NOT die? Don’t Bet on It[/url] )

Of course, Inklings aren’t real money, so I guess my objections don’t work. Maybe I’ll set something up…