iOS 5 Beta 2 is now available for download from Apple's developer site. If you are a paid ($99/year) dev, you can sign in with your developer credentials to gain access to this beta.
The beta is, as always, released under the terms of Apple's NDA. For that reason, enhancements, APIs and features are not listed within this post.
TUAW's iOS 5 coverage -- researched and written by our non-NDA staffers -- is available here.
Happy developing everyone! Thanks, everyone who tipped us.