At this time, there are approximately 60,000 apps available for blackberry users. Those apps can be downloaded at Blackberry App World.
There are many free apps available to the modern Blackberry phones. The Blackberry World app store has the most up to date listings, and includes free apps such as Photo Studio, Facebook and Battery Booster.
You don't download blackberry apps on your computer you do it on your blackberry.Dah
Yes, there are several apps available for a Blackberry that would function as a GPS. You can download these apps and more at http://us.blackberry.com/smartphones/features/gps.jsp.
The blackberry app world
There are several separate parts of this question. Can the Blackberry be jailbroken - yes. Will doing this void your warranty - yes. Can Blackberry OS 2.0 be jailbroken - presumably, though as best I'm aware there isn't currently a tool for doing so. Source code for Dingleberry is available, though, so feel free to modify it yourself. Will this allow you to download free apps - maybe. It won't allow you to download apps that cost money for free, but it may allow you to download apps from places that have free apps.
Pandora
you go on your apps and type in blackberry messenger (BBM) and click download you might have to pay though :)
No
You can download the Blackberry App World from your phone or computer onto your phone, and it will allow you to get new apps for you blackberry phone.
firstly you can, secondly you just need an account!!
You have to download the Blackberry app world, and then you can either download apps from there or go to the app world website and get links sent to your phone and then download them.
Yes - all you have to do is download Blackberry App store from the blackberry website. It can be done on your computer and your blackberry.