I booted from the Live CD and started GParted to delete the ubuntu partitions. I now have a bunch of free space and 2 Partitions: Macintosh HD, AND, a fat32 partition called EFI that takes up about 200 mb. Can I delete this? Is it just for bootcamp? Or is it a some secret partition that Disk Utility doesn't show, and bad things will happen if I delete it? I can always reinstall Mac OS X from a time machine backup, but please, someone who knows tell me if I can safely remove the EFI partition. Also, it has the "boot" flag. Thanks!
By the way, I am planning to reinstall ubuntu following this guide, using rEFIT and the Disk Utility, not bootcamp.
EDIT: I didn't delete it to stay on the safe side, but now when I hold down option it shows windows along with Mac OS X, and in rEFIT it shows linux. But in the Disk Utility it doesn't show the EFI partition. So should I delete it? Doesn't anyone know?
EDIT: I'm almost positive that the EFI partition is important for firmware updates or something and that it's not the cause of rEFIT detecting linux. But please, see my other question.