Here’s a great Blackberry tip from Mobilewhack– saved searches that you can can assign to a hotkey:

MobileWhack: Virtual Inboxes on BlackBerry

Much like Mozilla Thunderbird and the new Mail.app coming to a Mac near you in Tiger, you can perform saved searches on the BlackBerry too, giving you the ability to see a virtual folder that dynamically matches your search criteria.
From Messages click in the wheel and go to Search.

After you fill in your criteria for the search, pick Save from the menu, and assign a hotkey you want to use. Now, when you’re in Messages, you can instantly view a virtual inbox that shows you matching messages.