I've been using my eMac as my media server-cum-iPod docking station for about a year and a half, and it serves its purpose just fine, but I do have one serious gripe: That keyboard blows goats.
Seriously, could it possibly have less tactile feedback? Perhaps if they used stale marshmallows under the keys instead of fresh ones...
The only reason I haven't replaced it with the old keyboard from the iMac is that it's footprint is so much smaller, which is an important consideration in a keyboard that gets used maybe once a week. That and it's... well, prettier and cooler-looking, and the white keyboard matches the eMac. How Mac-dorky is that?
One thing that I am impressed with, however, is how useful it still is for web surfing; for a six-year-old machine, it's still capable of most everything short of gaming or video-heavy applications.