Good news for those of us with the GMA500 (Poulsbo) graphics card !
Fedora 17 ships with the 3.3.4 kernel and my GMA500 works out of the box without the need for any customizations to the boot options. Simply put the .iso onto a flash drive and boot.
Again, the gma500_gfx offers 2d graphics (no 3d). So while gnome-shell is working with llvmpipe, but there is a noticeable performance hit.
While it is novel to see gnome-shell running on the GMA500, I suggest the kde spin (if you want eye candy) or the xfce or lxde spin.
The gma500 should work, with 2d graphics, using the 3.3.4 or higher kernel, on any Linux distribution.
You may need to add (kernel) boot options for suspend or brightness keys. These features are often BIOS dependent.