WordPress 3.0 Beta 1 has arrived! This is an early beta, means there’re a few things still not-finished. “We wanted to get people testing it this weekend, so we’re releasing it now rather than waiting another week until everything is finalized and polished. There’s a ton of stuff going on in 3.0, so this time we’re giving you a list of things to check out, so that we can make sure people are testing all the things that need it. Things to test: Play with new default theme, Twenty Ten, including custom background and header options; Custom Post Type functionality has been beefed up. It’s really easy to add new types, so do that and see how it looks!; WordPress MU users should test the multiple sites functionality to make sure nothing broke during the merge. Install WordPress Beta Tester plugin, switch over to beta and download WordPress 3.0 Beta 1!,” states WordPress dev blog.