I've been working further on the google voice app for windows mobile. Larry pointed me in the direction of some code that makes HttpWebRequest handle form posts. From this I've managed to successfully post a form. However google relies on cookies, and the Compact Framework version of WebRequest doesn't use cookies. I'm going to have to deal with the reading and writing the cookies via headers for the response and request. I haven't made this work yet, but hope to sometime soon.

-MBirchmeier