I have encountered huge bugs with USB in the Pi for things as diverse as wifi streaming, network HDD sharing, bluetooth, webcam snapshots, and microphone access. I keep reading these rave reviews about the Pi and wondering: is it just me or is this thing practically worthless for anything outside of AV playback (for which it admittedly works well, at least for hardware-accelerated codecs)? What are you doing with your Pi that makes you so happy?