ZLaunchy was written mainly for those who like the way Windows Mobile dialer allows searching for contacts in a T9-like way – so that finding Adam means choosing 2326 in the phone application. ZLaunchy uses the same idea to run programs on your device. What it does is gives you a dialer keypad and when you type in a series of digits, it searches for all programs that match – for example to start Internet Explorer, start typing 4683 – Internet Explorer and Internet Sharing should show up in the result list.

Application performs a search using all items in the Start Menu. It also skips showing application icons, which causes it to work faster than usual application launchers. This makes ZLaunchy a perfect candidate for an application that’s bound to a hardware key (using system settings) and have it always handy when you want to find an application quickly.

http://forum.xda-developers.com/showthread.php?t=553892