To judge by pop culture (tv shows) and anecdotal evidence, lawyers have been one of the strongest markets for the BlackBerry. Given that, RIM might be getting worried by stories like this:
"You can open to review all PDF and Word files and Excel spreadsheets, and shortly Documents to Go will be available that will allow you to edit these files on the iPhone," he told The Industry Standard.
That explains why they rushed the Storm to market. Had the UI not been so clunky, I might well have stayed with Verizon - I had been using their service happily since the mid 90's. RIM has the harder job, too: they have an installed base that wants and expects the real keyboard, but they also have Apple harshing their mellow with the touchscreen. Not an enviable position.