It's not exhaustive, but
informative. Joshua Drake has been using Linux professionally for over 10 years, and he shares his opinions and
comparisons in an admittedly subjective but thorough comparison
of the five major Linux distros
for "non geeks." The comparisons are between Red Hat ES, Novell SLES,
Fedora FC4, OpenSuSE 10, and Ubuntu Breezy Badger. Notice Linspire isn't in there? Again, this isn't exhaustive, but
it's a quick read, especially if you know someone considering Linux, but they don't know which "Linux" to
pick. I've been playing with Ubuntu myself lately, and will post some thoughts on it soon.