Backtrack Live Install, Dual Boot from Grub
"This is another method to create a live install of BackTrack 3 on your HD. The need for this was that an install of BT was required for a machine with only 4gb of disk space and that it also needed to be dual booted with another linux distro from grub. This is a very simple live install with no persistancy. it has been done on an eeepc."
http://backtrack.offensive-security.com/index.php/Howto (scroll down)