This has got be some sort of a record: five distros in three weeks.
I started with Ubuntu 6.10 (couldn't get it to display higher resolutions; GNOME sucks), moved on to Mepis 6.5 (great distro, but no sound, no go), followed this with Mandriva 2007 (first step towards using it: it should, well, install), turned to Gentoo in despair (no comments, except to say that once you are used to the ease of installation of the mainstream distros...), and finally returned to OpenSuSE, albeit to 10.2.
One disturbing thing I noticed is how some of these distros glibly overwrite the existing GRUB entries. Not nice, and not something any self-respecting Linux distro should do.