Syncing Devices Using OTA(Over The Air) Process

I need some help on transferring applications on my SD card. And also, what are the uses of SD cards? I also have questions regarding syncing Over The Air (OTA). I used OTA when syncing with Treo Palm and MotoQ. I want to know now, if there is an OTA or syncing using the Bluetooth feature of Blackberry 8800 series? If it’s not available with it, what is the use of pairing my Blackberry to my computer via Bluetooth?
