Cool Knoppix based distro

I am not really a Linux user. I find it interesting so I will occasionally dual boot my machine or live boot a CD distro. I have used CD distros at work to recover data from unbootable hard drives. In the past I used a distro called Penguin Sleuth (I'm too lazy to look it up and link it - Google is your friend) but I've recently found one that I may like even better. It is called Helix. I like it for a couple of reasons. First it has all the data recovery and system information tools that you would probably ever need. Second if you put it in a running windows box it has a buttload of windows tools to do the same thing.