|Oh!, you are something special ...|
You can try Gnome 3 without installing it on your current GNU Linux distribution and can just download a fresh Gnome3 based distro "ISO" image from their official site (currently on OpenSuse and Fedora). Unlike the previous Gnome desktops, the version "3" does bring a lot of changes. Have a look at this official YouTube channel video (featuring Jason Clinton).
I haven't been able to find a hardware requirement page for Gnome 3, but while reading their official faq, I found that you should be able to run Gnome 3 even with a graphic card that it 5-6 years old. And to get the Gnome3 experience, you do need a graphic card with hardware acceleration.
And almost all of the applications that are designed to run in Gnome2 should run in the new version 3 as well (including the GTK+ themes).
Fedora Core 15 is due to be released in May 24 or something (2011) I think, but I will not wait till it comes out try the Gnome3. If you have used Gnome3, could you please share few thoughts?...