As suggested: Check out the BlackBerry 101 How-To Lecture Series ! This will help you with the basics such as downloading apps, themes, wallpaper, ringtones. It's also a good idea to browse the forums and read as much as possible. Many questions you have are answered there already!
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Latitude is a feature of Google Maps that lets you see your friends' locations and share yours with your friends. Select Latitude from the Google Maps menu or install the newest Maps version to get Latitude
Geocache Navigator provides you with robust online resources to help you:
*Search for geocaches in your area on-the-go
*Read logs, descriptions and hints on your phone
*Connect wirelessly to caches
*View cache locations on a map
*Navigate to the cache using a digital compass or unique radar-like display