The official script may have minimised 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.
The guys at winandmac say they've noticed a change in the YouTube app's stream handling. Now, instead of defaulting to the low-res OTA version of a YouTube video when connected via 3G, the app plays the high-res version previously reserved for Wi-Fi.
It's only been few hours since Beta 5 burst forth into this world, naked and screaming, so more changes are bound to bubble up to the surface—there are already rumblings that new anti-tethering measures have been implemented, but this hasn't been confirmed (and may have more to do with new security features in iTunes 8.2 than iPhone OS). [winandmac and the iPhone Blog]