Let's say you want to replace your windows OS... or maybe you
simply want to try this "Linux", but you're not sure about
what you should do... First of all, you should know that there is
not "a" Linux operating system: there is a kernel, but there are
many different user interfaces (the "windows", just to be clear).
While MS Windows has relatively few flavours (Home, Pro, Media
Center, for instance), there are heaps of so-called Linux "Distros".
Which one should you pick? Depends. You want a permanent MS
Windows replacement? What are your common tasks? You just
want to try Linux, but without installing anything onto your hard
disk? The answer to this and many more questions can be found
on Distrowatch, the most complete website about currently
available Linuxes. Have a look at it, it's definitely worth.