mel_0nline

I have several php (Content Management System) Sites. Much like this site which uses V bulletin.
Except I am using an open source CMS. When I view this Axim site on my PPC, its one of the best I have seen. I see it auto detects I am on a mobile device?
(WM 5.0)
Its navigation is the best! I am not sure I am posting this in the right place but can someone direct me to where I can find information to designing my sites to be compatible with mobile users.
I prefer open source, since my sites are non-profit. However I would appreciate any contributions to information.
Thanks :love:
Mel