I have the Olympus VN-3100PC
I have used it this entire semester for A&P and it works great. I have only changed the batteries (2 AAA's) two times this semester. I use it 4 times a week, for at least 2-3 hours a day.
You can upload the files to the computer program that comes with it, change it to MP3 format...it is a great deal.
Also, most people don't even realize I am recording, it is the size of a small cell phone.
The best part, it is under $50 @ Radio Shack!
http://www.olympusamerica.com/cpg_se...p?product=1272
Good luck! It has been so helpful, my prof even asked if I could email him a copy so he can put his lectures online!
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