i can't say your progressing....even at first glace they look rather amatuerish, i am sure you could have learned many new things during your times making sigs, i suggest you fiddle with new things, maybe get photoshop, but if you are going to stick with one similar style...at least make it a good style....
Its a little (literally) Unix-like OS. it uses about 1MB of ram, you can run it as a virtual OS or regular on bare hardware, it uses its own programming language (Limbo) and all the names of the apps in it are based on names from Dante's The Divine Comedy.
It runs kinda like a Linux VPM i used to have. It uses the Charon web browser (Simple, yet functional), and it's overall a good OS.
the fourth edition is out. get it for free (Personal licence) at http://www.vitanuova.com