Just a quick update, but following information provided by diligent users, we have some lines of investigation which we are pursuing on the freezing issue which can sometimes occur with iPhones or iPods running the new 2.1 firmware. We've also managed to reproduce this ourselves on a test device, and are working on a consistent reproduction case to nail it down.
If you encounter this problem, please do e-mail support with the subject 'iPhone Freezing Returned'. We've had a number of users send in reports, but more information is always good. Please include some details about--as best you can recall--the last operations you were performing before the freeze. That information is especially helpful. Things like, were you adding an entry, changing one, or not changing anything? If you were changing one, was there anything unique about the entry? We may not respond individually to each e-mail, but we are studying them.
And our thanks again to all the users who have sent us information. Thank you!