It would be a great time-saver if the desktop downloader could function without having the blackberry connected, then synchronize with the blackberry later.
The one thing I still miss about iPod + iTunes is that iTunes would download new podcast episodes overnight, and I could quickly sync in the morning before leaving for work.
The desktop downloader saves bandwidth, but doesn't save much time, since there's a lot of overhead involved in requesting and processing the feeds
I know it would be a significant effort and would take time away from the BB app, but it would be a killer addition to PT.