The official script may have minimized it as a maintenance release, but some users are finding out that iPhone Beta 5 contains more than bugfixes. So far: YouTube's improved, and hacked MMS is no more.
Can you feel that? That electricity in the air? Yes, it means that the final release of iPhone OS 3.0 is closer than ever, and here is iPhone beta 5—build 7A312g—to demonstrate it: [Updated]