Prices for memory seem to be on a downward trend. With rebates, I picked up a 2GB SD card for ~ US $80. It's nice to be able to see the songs on-screen. There is an iPod add-on mentioned above, but for US $200, I think I'll take a pass on that. The sweet spot would (IMHO) be for less than US $100, but it's a niche of a niche market and likely not profitable in the short-run.