Question: Has anyone checked out a copy of Drupal 7 yet? What do people think?

I'm pretty excited about the PDO and all of the designers I work with a very excited about the new admin interface/structure.

Do we have any Drupal core developers here on Stack Overflow?

Answer: 
I finally got around to signing up on SO, and I'm a core contributor. I'm obviously biased, but I think Drupal 7 is even more of an improvement over D6 than D6 was over D5. The easiest way to give it a spin is to sign up for a [Drupal Gardens](http://www.drupalgardens.com) account. It'll take a little while to get an invite though.
Drupal Gardens is now in public beta; it is free, and you can export your site at any time. Check out the [FAQ if you know Drupal](http://www.drupalgardens.com/content/how-do-drupal-7-and-drupal-gardens-differ).