GMenu2X is a very very good alternative frontend for the GP2x/Wiz/Caanoo. It supports overclocking, sound volume setting, touchscreen, etc.

GMenu2X allows you to create direct links for your games & applications so that you can directly launch them without having to browse through all the filesystem manually, resulting in a better user experience.

http://dl.openhandhelds.org/cgi-bin/caanoo.cgi?0,0,0,0,7,500