Most of them should be compatible. In the event you have an app that is license specific to a device (Beejive for example) most of the app companies have a process that allows you to transfer to a new device.
Posted from my CrackBerry at wapforums.crackberry.com
Ya, im really hoping that i wont have to re-puchase some like bbweather, berry popup, etc... obviously the Storm specific apps i will have to but i was just curious