Didnt see this mentioned so I thought I would post some of my findings.
Linux 2.3.99.x, NFS, Linksys 10/100 USB nic, mpg123, and unmodified hardware on the WS, is not fast enough to play mp3's (without skip) over NFS. It is fine playing mp3's locally from a hard drive but the extra burden of USB puts the CPU at 180Mhz over the top.
Is there a faster mp3 player or should I just overclock the CPU? Im a little hesitant to OC the cpu, cause I dont want to stick any more money into this with a better fan. (used up all of my junk fans on other projects already ;) ) Has there been any issues with 266Mhz and the stock fan / heatsink?