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A while ago I thought about the same idea, but I found out Google is already working on it http://labs.google.com/ridefinder

Ridefinder has been around for a very long time and it hasn't really taken off. Don't be afraid of them.

a full copy/paste of http://www.mattcutts.com/blog/cab-finder-application/ ?

It's a good idea, too bad it's only for Android or iPhone... I'll have to continue thinking on ideas for Palm OS, Windows Mobile, Symbian, Linux mobile phones, RIM BlackBerry or JAVA phones... XD

Idea for a startup...