I have a feeling I'm among the dwindling few hanging onto an ATV1. Mine has been upgraded with 450gb hard drive, which I've loaded up with over 100gb of music alone.
It's an integral part of my whole home audio, using Airtunes from ATV1 to send audio to 4 different Airport Expresses thruout the house. I use the analog out on ATV1 so I can send audio to Zone 2 of my AV Receiver to pump music thruout my backyard.
ATV2/3's don't appeal to me because I can get other features outside of Apple ecosystem from my other components.... xBox 360, TV & Blu Ray player. However, I get the attraction of ATV2/3...just wish future versions would add ability to add an external hard drive (with analog out) for those of us who don't want to have to stream AND want to use our AV receiver zone 2's which almost always accept an analog signal only.
Cheers!