NStatic is not yet in beta. I have a couple of people on NStatic, and am still fixing a number of bugs.
I also have events going on in my life. (surprise) My parents and siblings flew in the first week of May to visit me, which I targeted mid-to-late date for closure, since these events are disruptive to my flow. I have also been unexpectedly invited to a Microsoft compiler lab event next week to attend, which will most likely be focused on recent announcements such as Silverlight, DLR and the Orcas beta.
It'll be beta when it's ready; stuff takes time to cook. There are no more major changes or additions; the existing feature set is good enough.