So just what version is it that I have installed to my hard drive?

I used the latest Knoppix CD from last month, and when I view the version text file it says its testing/unstable.

I know its Debain, but which version did this testing/unstable thing eventually become? Folks are telling me its an old version and I should upgrade to solve some of the speed problems, but since I don't know the actual revision, I can't make a choice.

Thanks much.

John