The best linux version for a DELL

What is the best linux version for a DELL Latitude D600 laptop?

Almost any distro will install with a dual boot option. Which distro you install depends on how much horsepower you have and what you want to do.

Since there are over 300 distros, and a few CDRWs are pretty cheap, download a few that sound interesting and try them. DSL (Damn Small Linux) or PCLinuxOS minime might be good for a smaller computer, but Ubuntu might run well too.

They're free - take 2. Or 20. Have fun. That's what it's all about. (Until you decide to earn your living doing what you do for fun.)