Is anyone else seeing this ? I'm running a late 2009 mac mini as a media server with iTunes and a firewire connected Drobo that's hosting the files. For some time now, it's been refusing to sleep - if I force it to sleep, then after maybe 10 mins some polling process somewhere brings it back to life. I finally sought to track the cause today - I swapped the firewire for USB, I checked there are no other processes running (including the drobo dashboard) and discovered it's iTunes itself that's preventing the mini from sleeping. If I close iTunes down, my mac (and the connected Drobo) sleeps like a baby. I'm not sure which iTunes version this kicked in with, but I've yet to see any references to it on their support forums (although I'm probably not looking in the right place maybe ?).