The video below gives an overview of the ASA, AAS methods for proving two triangles are congruent.  Keep in mind, that he does not write everything out as we do in our proofs!  You can gain good practice by doing the proofs he does on your own after watching the video...but be sure to write everything out like we do in class!

http://www.youtube.com/watch?v=lmMsNAs8nnU

Here are more videos for both ASA and AAS:

http://www.youtube.com/watch?v=IEUMc9pQ-jU&feature=related

http://www.youtube.com/watch?v=pZZADeU3khw&feature=fvwrel