This has almost got me sold on trying the desktop disk, but the bigger picture dictates all sorts of questions. It does seem that Linux has everything on board, but what about, for example, the hundreds of files I have in Word or Excel formats - will I still be able to open them? Is it really safe to run Linux online with no additional security software protection? How easy (possible) would it be to switch completely from Windows to Linux, and still have all the facilities I have in Windows? There is also the potential cost of replacing all my Windows software with Linux equivalents. It does seem quite attractive if one were starting from scratch, but I'm going to need a lot of convincing, as an existing Windows user, that it would be viable and worthwhile, attempting to switch entirely to Linux.
Oh, and what's the difference between Ubuntu and Knoppix? I like the Knoppix pic better!