Whoa, today I had a privilege to test two new releases: Mandriva 2008 and Ubuntu 7.10 Gutsy Gibbon. The reason I'm writing my topic from the first one is that I could not boot up the system with the Gibbon.
492 MB SDRAM
950 MHz Intel Celeron III
NVidia Vanta 16MB
MP3 files are running with the liveCD, Gimp 2.4 works too.
Edit: I succeeded with Gutsy too. It took more time. They've fixed the issue with Realtek 8180L wireless card