Did a nearly flawless upgrade from Mandriva 2008 to 2008.1 (spring) yesterday. Did it all on-lne, no cds needed. Simply pointed to the 2008.1 software repositories and told it to upgrade.
1770 software packages and a reboot later, and I have 2008.1 up and running. 3-D desktop works better than ever, and the whole system is snappier too. No issues with apache, mysql, amarok... in fact, nothing that I've found.
http://wiki.mandriva.com/en/2008.1_Tour