I have two of the Olympus models like this:

http://www.radioshack.com/product/index.jsp?productId=12755115

It has a bayonet style slide out USB port (male) and it records 15 hours on 1 AAA battery. It records in .wma (default) and .mp3. In hindsight, I should have purchased the next model up which has a Lithium Ion battery and recharges from your computer USB port. Record quality is excellent and the mics are horizontally opposed for improved stereo spread.