The best way to learn though is to use it as your primary OS. keep it installed and try to accomplish any tasks you would normally do on the computer using linux. For ex when you need to print a google map, check the ITT forums, write a word doc, listen to music etc. do it in Linux. If you encounter some stumbling box, the #ubuntu IRC chat room is very helpful, as is the Ubuntu Forums.
Welcome to the community, and Rock on!