Bukkit

• Much, much faster generation. You may now run off in one direction without stopping and it will keep up. No more lagging people off, no more horrible generation time, it's way better now.
• Got rid of the console spam and made a useful memory gauge. The world I generated made about 50 MB of extra memory. While larger than I thought it would be, the memory usage is pretty small when compared to minecraft in general. I will be working on saving schematics to the hard drive to save ram.

• Uses more than the normal amount of memory
• Sometimes the spawn position puts you in the air and you fall to your death (Multiverse fixes this, I'm looking into it)

For those who don't know how to use generators, put this in your bukkit.yml file:

worlds:
  world:
    generator: AeroGen

or learn about the multiverse plugin