I’ve been installing the Karmic Beta release on everything I have around here, and the news is generally good. Some of this I have mentioned before, and some is new; some is significant, and some is trivial… so here we go!
More here

First, in the category of “mentioned before” and “significant”, we have GRUB-PC, also known as Grub 2, which is the standard bootloader with Ubuntu 9.10. The last time I mentioned it, I said that by going to the “Advanced” button in the final installation screen, you could choose to install GRUB to the root partition rather than the MBR, and thus not screw up your existing installation.