As one Linux n00b to another: I am trying Xandros right now, and I can't recommend it to you. Reasons:
It's a expensive experiment - 99USD
Although it installs like a dream, with an excellent (re)partitioning tool and an a boot loader for your (perhaps) dual boot, and has really good hardware recognition, once you're done you have Linux for idiots, with a very pretty GUI, and a proprietary and idiosyncratic back end, even if the kernel is Debian.
The only app that works really well is Mozilla, well maybe OpenOffice as well. Others are variable, some very limited in what they do, some primitive
There's very little on the Xandros Networks software list, no updates, little new.
Some of the downloads which are there and useful - like Evolution - either aren't all there, or the packages are flawed. I did the download/install (of Evolution) from Xandros and ended up with no Help, folders I can't access, although they exist in my profile, & etc.
Installing deb or other types of packages from other places is really really iffy, although they have a tool that's supposed to help. I did get Opera to download and install properly (whoopee! now I have another browser). On the other hand, a later (stable) version of Mozilla straight from Debian wouldn't.
"CrossOver" doesn't deliver. Says it supports IE 5.5, but in functionality it's a sorry version of IE, many options you don't have, and much it won't do. I stopped there, didn't even try to install M$Office.
Read MY Lips: N-O F-I-R-E-W-A-L-L
In summary, there's great promise in this distro as a replacement for desktop Windows, and it's reasonably priced from the point of view of a license that allows you to install one copy on all your personal computers and one "business" computer, but it's not yet ready for prime time in this, it's intended market. Probably a poor choice for a computer enthusiast to learn Linux on, even if you can get it up and running quickly.