In a Memorial Day treat for users, Wil Shipley of Delicious Monster announced via a tweet earlier this evening that a beta of Delicious Library 2 is now available for download and purchase. We've been waiting eagerly for DL2 for quite a while now, along with everyone else.
Interestingly, on first launch of the new beta you're presented with the dialog on the right. Apparently DL2's scrolling and display performance relies on fixes delivered in Mac OS X 10.5.3 -- that is, fixes you can't get yet in an OS build that hasn't shipped. Patience is a virtue, I suppose.
Update: Wil Shipley replies below. The beta test is of the integrated store functionality in DL2; the software itself is not launched yet, so be cautious.