Should I make a tutorial about collision detection?

Hello.What do you guys think,a tutorial for 2d collision detection/solve would be welcomed?If so please give me some links for screen record software on Ubuntu.

P.S:Where can I join the IRC channel??

For screen recording I like using SimpleScreenRecorder:

sudo add-apt-repository ppa:maarten-baert/simplescreenrecorder
sudo apt-get update
sudo apt-get install simplescreenrecorder

Thanks,the program works perfect!