I have the hero and want to disable services such as gmail.

How do I do it?

I have my own mail server so do not use gmail but it starts each time the phone boots.

Also, why do things like Google maps load?

Mozilla/5.0 (Linux; U; Android 1.5; en-gb; HTC Hero Build/CUPCAKE) AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/525.20.1