Launch Box is generally an application launcher. It's very influenced by Quicksilver for Mac OSX. Remember that this is only a first release so don't get your hopes up too much. Launch Box is written for the GNOME 2.10 platform and depends on GTK+ 2.6, evolution-data-server 1.2 and gnome-menus. These are currently hard dependencies but the plan is to split out the backends into different optional backends.