See above. I like when Mac products "just work" -- except when they don't. In this case, I have a 2009 MacBook Pro and a mid-2007 iMac. I also have a 500 GB Time Capsule updated to the latest firmware. Not that it should matter, but I also have MobileMe. I've turned on the "wake on network" feature on the iMac. If I tell the iMac to stay awake, I can reach it fine (same as in Leopard). If it goes to sleep, it's unreachable. The way it's supposed to work, from what I'm reading, is that it's supposed to be accessible by advertising to the Time Capsule that there are services available (e.g. file sharing, screen sharing, etc). My question: how can I be sure it's properly advertising this info to the Time Capsule?