The Ubuntu developers are moving very quickly to bring you the latest and greatest software the Open Source community has to offer. With "Intrepid Ibex" Alpha 5 come some new features as well as lots of bug fixes.

New Features in Intrepid

GNOME 2.23.91
X.Org server 7.4
Linux kernel 2.6.27
Encrypted private directory
Guest session
"Last successful boot" recovery entry

More Here