This is a how to I wrote when 11.04 was new. It's using Lubuntu, a lighter buntu version more suitable for fit-pc with working GMA500 drivers.
Fit-PC 2 as HTPC using (L) Ubuntu 11.04 Natty Narwhal
I will update my media center with 11.10 when GMA500 is sufficiently supported with those kernels. Will keep you guyes in mind whenever I write that how to
