Depending on your wireless syncing service, you should be able to sync your desktop application's Calendar, Contacts, Tasks and Memos to your BlackBerry device. The trick for viewing categorized Tasks (as we recommend) on your BlackBerry is to select Menu > Filter. We do not endorse or recommend any particular BlackBerry application at this time.The built-in BlackBerry applications work quite well, in our experience, to structure your GTD lists and reminders. We have a GTD & Blackberry Setup Guide that is an excellent resource. You may also want to search our Forums and GTD Times for resources specific to BlackBerry.