minecraft.net goes live, and you can save your levels now!
The old alpha play site now points at minecraft.net.
If you’ve registered and logged in, you can save your levels in five slots. To share a level, simply provide a link like this:
http://www.minecraft.net/play.jsp?name=<username>&id=<the slot you saved in, starting from 0>
So for example, my first level is:
http://www.minecraft.net/play.jsp?name=notch&id=0 (try it, it actually works!)
I will provide an easier way of sharing maps later on. =)