On the legalisation of prostitution. I tend towards the more extreme libertarian position, which is also being blogged a lot (you want links?), but it is a good post.
Much more fun is Tyler's post on interstellar trade.
As you approach the speed of light you move into the future relative to more stationary observers. So can you not leave a penny in a savings account, take a very rapid spaceflight, and come back to earth "many years later" as a billionaire? Hardly any time has passed for you.
Sooo, what happens if everyone does this?