Cardapio can work in two modes: as a panel applet (in which case it is an alternative to Gnome's application menu applet) or as a stand-alone launcher (in which case it is an alternative to the simplest use-cases of Gnome Do). It has a beautiful gtk-native interface and includes plugins for performing inline searches of Files (via Tracker), Software Center, Google, Wikipedia, and much more!
Install Cardapio in ubuntu 10.10/10.04
Open the terminal and run the following commands
$ sudo add-apt-repository ppa:cardapio-team/unstable
$ sudo apt-get update
$ sudo apt-get install cardapio
To use as a panel applet, simply add it as usualRight-click the panel, select "Add to panel", then choose "Cardapio".
Cardapio in action