RichD, if you want to learn a lot about Linux on multiple levels, I can suggest a few sites.

www.raiden.net <- my old tech site. I recently handed it over to the community, so it's under different ownership, but they're still very much focused on helping the new user learn about Linux.

www.phoronix.com <- great site for learning about hardware under Linux.

www.tuxmachines.org <- Lots of great Linux news, tutorials and info collected from the web.

www.linuxdevices.com <- A great list of all known Linux powered hardware.

...and of course, this site! Hope those are a help to you.