Getting the Tony Buzan book is a good idea, but I don't know how practical taking mind map notes in class actualy is.
I've tried doing the same at college level and found that a lecture just doesn't give you enough time to organize your thoughts enough to create a good Mind Map. And there are the times the teacher goes back on some matetrial he/she forgot at the begining!
I found that taking traditional notes works best in the classroom because it's not as structured as a Mind Map and you can take corrections along the way. I'd make the Mind Maps at home as I was reviewing my notes and had the time to organize the thoughts properly.
I liked doing it this way because it allowed me to actualy think about subject matter as I was putting the Mind Map together and it gave me time to make the mental imagery in my mind (remembering by associating the links of the Mind Map).
I always regreted not taking this whole technique to its full potential because I felt it could be a very powerful tool for learning.
Cheers! 
