If you want a cheap usb SD card reader/writer, head to fry's and pick up the cheapie PQI brand. $10 reader and it works great. I use their CF reader and love it. Plug it in and my SD card shows up like a hard drive. Transfer mp3's. DONE.

It's usb 1.1, not 2.0. But if you just need a cheap reader/writer, this is it.