Santa was good to me. I have an eee pc 8G.
The sound quality is fantastic, better than my Creative Labs mp3 player or my Panasonic CD walkman.
The video player is great, it plays evey format you can think of, and the display quality is great.
The eee pc 2G has only 2G of memory, and the OS takes around 1.5G, so you will only have 500Meg or so left for your mp3s. It has an SD card slot, so its easy to add memory.
The batteries last 3.5 hrs for the 8G model, the 2G is specified at about 2.5 hours. You could probably exend the life a little by turning off the screen, but even if you just use it as a music player, it will need charging frequently.
I have not played with it much yet, but so far I like it a lot. I would say if you are in the market for an Archos/Cowon/Zen vision, you should give this a look.