Probably can’t quite use the WordPress gallery full-time yet. In particular note the picture that is not rotated correctly, the lack of f-spot support, and some UI quirks. But I’d guess that within another wordpress release or two I’ll switch away from gallery after seven years. As usual, the product that combines ease of use with extensibility wins.
[Edit later: apparently also it doesn’t actually create thumbnails, at least not by default or perhaps in this theme. Apologies to all who tried to grab these huge files.]