I'm TortueG, a young french guy living in Taiwan. I've been an (happy) iPhone user for almost three years but lately (2 days ago!) I've decided to give it up (to my miss who just lost her phone) and finally bought myself a Bold 9700 and I'm really really really happy about it (except the fact that I still did not managed to set up my Gmail account...) even if my iPhonized brain makes things harder, but I'm learning
I'm also thrilled to have found such a nice website/blog (Crackberry.com) and vibrant community (you!), thanks to all the posts I've learnt a lot of stuff!
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!