使用iPhone 3.0 SDK对MAP使用有哪些限制？

I am the owner of a project that uses open source maps for an iPhone 2.0 app. My team and I are debating whether to upgrade to the iPhone 3.0 expose Map APIs, but I suspect that Google and Apple have put restrictions in just the wrong places. What barriers are out there?I am the owner of a project that uses open sour