Dropbox

The app itself works great, as it basically utilizes your finder window to do most things. Just interact with the finder window, highlight the file/folder, then do a vo+shift+M, and go to the dropbox sub menu to access options. Don't try reading the status of incoming and outgoing files as that part is up in your status bar, and is quite broken in Snowleopard, and from what I can see, is extremely! broken in Lion. If you have growl enabled, it at least will tell you when you've had something added to your dropbox, but no go on the upload side of things, which is a shame.