Hovering over works using dasher 4.2.0-0ubuntu1 in edgy. Looking at the .desktop file there is a Comment= line there too.
** Changed in: dasher (Ubuntu) Status: Confirmed => Fix Released -- Dasher missing "hover" pop-up dialogue in menu https://launchpad.net/bugs/39997 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs