I recently purchased the Olympus WS-400S from Staples.
I haven't had a chance to try it out in a lecture situation yet, but from a few test runs, I like it so far.
Things I especially like about it:
-Moderately price (about $65)
-1GB of storage space
-5 storage folders
-Direct USB connection: just plug it directly into your computer's USB port and transport the audio files!
-Also functions as a mass storage device
-Has "noise" cancelling settings
-Just looks nice!
-Expected battery life longer than Sony recorders and the newer model (WS-500) actually comes with rechargeable batteries
Overall, I'm really happy with it and I can't wait to put it to use! Hope this helps.