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: 
It looks good, and the API is now frozen so module developers can get going before the final release. 

A lot of the strength of Drupal comes from the modules and until they are on D7 it won't have a huge amount of benefit over D6.

The architectural changes are good and the api changes generally seem to be a step in the right direction. Personal favourite is RDF in core.

[Eaton](https://stackoverflow.com/users/19411/eaton) is still the top Drupal answerer on SO, and has done a lot of work on Drupal

[Greggles](https://stackoverflow.com/users/56791/greggles) has dabbled in SO and is part of the Drupal security team
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.