I tried this application too.
Entered my Blackberry Internet Service address in the field to send me the link for the download. Came through no problem.
Then about 3 minutes later, a welcome email to my work address via the BES connection. Completely different address.
They are hooked up somehow and I am not so sure I like it. I better not get slammed with spam. Not so sure I like the application anyway. It is simply NWS data parsed out for a mobile screen.