When is the best time to ask for recom. letter?

<p>Hi, everyone! I am planning to transfer to another university in Fall 2007. This semester I am doing very well in one of my classes, and i really hope this professor can write a reccomendation letter for me. However since it is towards the end of the year, and i can imagine how busy he is right now. Therefore i am thinking maybe asking him if he would like to write a recommendation letter for me next semester even though i won't take his class anymore at that time. Do you think this is a good idea? Thanks a lot!</p>

<p>That would be fine.</p>