Skyrim's Dawnguard beta invites are out, and now you can live out your wildest Tom Cruise Interview With a Vampire fantasy in the world of Tamriel (sans Brad Pitt of course). According to this great, cautious preview from our own Allistair Pinsof, the full version will net you around 15-20 hours of extra content, much like Oblivion's Shivering Isles (not bad!).
I really like the idea of a Bethesda beta test -- maybe if they keep up with this tradition, we'll have less signature "Bethesda glitches" to complain about. Plus, a Fallout 4 beta would be real nice (are you listening, guys?).
Be sure and let us know if you got one, and what your experiences are so far. Fangs for everything, Bethesda! Yuck yuck yuck.