This field is changing at a quick pace. There are some excellent sites to visit to keep abreast of the latest happenings in the world of BlackBerry:
The BlackBerry Forums (http://www.blackberryforums.com/) is a third-party forum site where users exchange questions and answers about BlackBerry. If you run into a problem, there's a good chance someone else has, too.
The RIM section of Howard Forums (http://www.howardforums.com/) is a frequently used forum for exchanging tips and tricks for BlackBerry usage.
BlackBerry Cool (http://www.blackberrycool.com) is an excellent blog that regularly posts software reviews, general news, and tips for Black-Berry users.
BBHub (http://www.bbhub.com) is another heavily posted weblog that highlights new software and news on the BlackBerry.
BlackBerry.com (http://www.blackberry.com) is the official site of Black-Berry. You'll find the latest handhelds, press releases, webcasts, and insight right from the source.
The BlackBerry Developer Journal (http://www.blackberry.com/developers/journal/index.shtml) is a free monthly email newsletter for developers that provides the latest techniques, APIs, and news for BlackBerry developers.
The BlackBerry developer forums (http://www.blackberry.com/developers/forum/) allow developers to interact and ask questions on anything related to the BlackBerry. There is currently a Java forum and a Browser forum.
The BlackBerry Blog (http://blackberryblog.com/) is another blog to monitor the latest BlackBerry happenings.
The BlackBerry tag on del.icio.us (http://del.icio.us/tag/blackberry) is a nice collection of the latest URLs that alpha geek BlackBerry users are bookmarking.