I have approx 10GB free space at the end of my hard drive. That's what I had left after I gave Windoze and Slackware 10 shed-loads of room and then made a 4GB FAT32 partition for inter-OS shared files. Ah, but what to use it for, that's the thing, bearing in mind that I want to keep on learning?
Do I try another distro even though I think Slackware is the dog's family jewels? Do I install Slack 10.1 (or even Current) with the 2.6 kernel and custom install (I have 2.4 kernel and full install)? Do I wait for Slack 11? Any suggestions please? (not rude ones).

want to keep learning what? you could always install another distro, maybe a slackware ( or whatever) for "testing", just trying things out without worrying about your main install. or, if you want to learn, maybe go for LFS ( linux from scratch - www.linuxfromscratch.org). If you go the LFS route, remember to learn why things are being done, try not to get in the habit of just typing the commands from the book without thinking it through. There are alot of things you can do with 10gb, so refine what it is you want to learn and focus on that.

One possibilty is to install linux from scratch , you will learn a great deal about how a distro is built and how packages are compiled and installed. when you're done, you can simply delete it or build on it, either way, its a great education.

Mad.

10 gigs? You could fit several of the smaller (single disc) distros on there ... if you have broadband, go to http://www.distrowatch.com/index.php and take yer pick!