Fedora 7
I have been trying various Linux distributions and found most of them good. recently I was interested in the newly launched Fedora 7, I have been waiting a lot for this one.
When I installed it for the first time I selected a lot of packages and during the package selection by mistake I selected the Virtualization also (I thought I would use it as an Vmware alternative) it install some Xen virtual machine. I faced a number of issues with it and finally had to reinstall Fedora, this time I was careful about the virtualization part and so I skipped it. Everything has been quite smooth since then, this distro is worth trying, if you have not yet tasted it.