Mobile Documents icon. I found a new icon in 10.7. It's called "SidebarMobileDocumentsFolder.icns", it looks like this: It's located in /System/Library/CoreServices/CoreTypes.bundle>Content>Recouses This is the location for all system-wide/Finder icons. 10.6 does not feature this icon. I think it'll be used for either: MobileMe/ Apple cloud document storage or A folder that shows up in your finder when you plug in your iPad so you can easily copy and manage documents stored on the device. UPDATE: iStats Pro tells me there is also a 'MobileBackups" TimeMachine disk mounted, I can't seem to find it anywhere on my Mac. It's 65.67GB big and there is no space left. Is this also a part of the new MobileMe?