First, yes your PB and BB 7250 both offer BT but at the moment I don't think you can sync with it or transfer files, just wireless BT headsets at the moment.
Second, the software provided with your BB is all PC based so its of no use to you if you have a PB, not sure if Verizon has a built in browser as yet for their BB's but you can look into Webviewer from ReqWireless www.reqwireless.com
Third, games and application will have to loaded and installed on a PC sorry but at the present there is no work around for this for us Mac users. Myself I do so on my work PC.
Forth, PocketMac is an excellent solution for Mac users but as I had mentioned above it only offers syncing capability at the moment. Yes it sync's with MS Entourage, iCal, Address Book, Now Contact/Now Up to Date and it also integrates with iSync.