The knoppix forum is http://www.knoppix.net/forum/
I like knoppix very much it is a modification of debian. It is great if you want to learn to use linux and not mess with your current OS. It is slower as it runs from your cd and resides in RAM. If you like knoppix you can install it to your Hard drive as well. Search the forums for the knx-hdinstall command and it will give you a step-by-step walkthrough on how to install to HDD. Just remember always back up and if you need any help on something specific you can message me. Your question is pretty vague. If you get more specific on what you really want to do then I-we will be able to give you more info. How I feel about it, I like it. What are drawbacks? Speed. I tried it like you did and I loved it so I installed it to my hard drive. It auto detects everything and works well. Now for i2c if you want a distro that works like knoppix with security tools you might want to check out knoppix-std, Just use it for good and not to try to hack the possibility to do good or evil are there. The site to knoppix-std is here std stands for security tools distribution. http://www.knoppix-std.org/