WordPress 2.0 “Duke” is available! Like 1.5 when it first came out I expect it will take a few months before the full implications of this release are realized. There are some surface changes (see 5 little things I like about WP 2.0) that still need some polish in places, but I think the underlying architectual changes are really rock solid. Interface changes are easy to iterate on in future versions. WordPress.org also has a rocking new design from Matt Thomas, and there will be some more action there in the coming months.