Hello and welcome to the world of Linux. Expect to have some serious fun
Yes, the
http://www.eeeuser.com/ site, its wiki and forums provide really good learning material. And help targeted at the particular version of Linux - Xandros - preloaded onto your device by Asus.
For a wider and more general approach to linux, try visiting
http://www.tldp.org/, where guides, howtos and all kinds of material written on the subject Linux is waiting for you to read them. Be prepared, though. There is a lot of material! From generic system administration and all the way down to the nitty-gritty of bootloader functionality, file system structure standards and just about anything else you will ever need. Overwhelming and indispensable at the same time
Also, try pointing your browser at
http://catb.org/~esr/ and
http://sourceforge.net/ for a taste of what to find in Linux World. ESR is an avid writer, and will most likely intrigue you. Sourceforge instantiates the potential of open source.
Finally, I can't help but pointing you at my personal pet thingie when it comes to the EEE;
http://wiki.debian.org/DebianEeePC
And now; go get it! All of it!
Yours,