sob, Act is "sync-able" with your BlackBerry. You need to download and install Desktop Manager on your PC, and simply use the calendar, address book, task and memos already on your BB. Then sync that data on the BB with your PC's ACT 6.0 application.
Download Desktop Manager here:
BlackBerry Desktop Manager Downloads - BlackBerryFAQ
You want the Version 4.2, Service Pack 2.
Read the description:
Organizer Support
* Microsoft Outlook® 2000, Outlook 2002, Outlook XP, Outlook 2003 or Outlook 2007
* Lotus Notes® 5.0.6 or later, 6.0, 6.5, 7.0
* ACT!® 4.0.2, 5.0 (2000), 6.0 <<------!!!!
* Lotus Organizer® 6.1
* Microsoft Outlook Express 5.0, 6.0
* Novell® GroupWise® 6.0.1, 6.5.4 or higher and 7.0
* ASCII Importer/Exporter
* NEW! Yahoo! PIM