Andrew Sarangan provided this link to his article on the subject:
http://www.sarangan.org/aviation/art...er-article.pdf

I thought Andrew's article was very well written.

I record nearly all my flights, not just training. I usually don't listen to
the full recording, but I like to be able to check a few minutes here and
there and see if I heard or said what I thought I did. Yup, I really did
acknowledge, "Follow the Alfa on Alfa." Yup, the DEN tower controller really
did call traffic at 9:00. (It was at 3:00.)

I like to have the device record continuously rather than use
voice-activated mode so I have a timeline.

I had been using an Olympus DM-1 I bought it in 2002 for $250. It could
record 22 hours on the included 64 MB card. I later spent another $100 for a
128 MB card. That card recently died. I looked for a replacement card and
found it's been discontinued. The few I found on the web were $100 each.

Fortunately, my wife suggested I look at new recorders. I found an Olympus
VN-3100PC at Circuit City for $75. It can record over 71 hours. Amazing! Its
USB transfer rate is much lower than the DM-1, but I can live with that.

Jon