GRUB

Ubuntu 11.04 (i still don't know its name) comes with a more recent version of GRUB. Here is a nice tutorial for it: Grub 2 Basics

What I did is: 1) install puppy 2) install ubuntu (both of them put their grubs on their partitions even though I had small 16MB ext3 partition for a boot loader - ubuntu installer does not allow putting grub on fat) ubuntu set its grub as the default one, and after that i reformatted the 16MB partition to fat and installed win7 on an extended partition, and win7 put its boot loader on the 16MB partition, but everything got fucked up and nothing wanted to load. I followed point 13 from the above tutorial (Reinstalling GRUB 2 from LiveCD ) so I boot the live CD and run

sudo mount /dev/sda6 /mnt
sudo grub-install --root-directory=/mnt /dev/sda
sudo umount /mnt
sudo init 6

that fixed everything
The next point in this tutorial 14 also seems interesting
Booting LiveCD and Other ISOs