Half the fun of getting the N800 is learning how to use it. By buying one you are already on the path to learning a few Linux basics.

One thing you could try is this (it worked for me!)

Download yourself a copy of Ubuntu (www.ubuntu.com) burn it to a CD and run it live (ie you don't actually need to install anything to your computer) or better still, install it on your machine.

Then get a copy of Beginning Ubuntu Linux by Keir Thomas from Amazon, and have a play. The stuff about the command line and the Linux file system is well explained. The more you read and play the more familiar you will become, and when you switch on your N800 and read here (or elsewhere) various tricks you can do from the command line, they will all suddenly make sense, because Ubuntu is similar in many ways to what the N800 runs.

The book is handy as it also explains lots of the works and files that are mentioned in these forums.

I guess this is not the cheapest method, as there plenty of free Linux tutorial web sites, but if you take a look at the book and do some experimenting you'll learn alot and be up and runing in a few days.

Good luck!