I've got a RCA Lyra. I'm happy with it and the price has come down from last year when I bought it. So has the price of the SD memory cards that work with it. You can put up to a 2 gig card in it. There is some onboard memory on it without the card too.

Needs a USB connection to your computer to transfer songs to it. Drivers for that are already included in Windows XP. Runs for a long time on one regular AAA battery.