Have created a demo blog powered by the latest release of v1.6 of WordPress.
I have set it to autoupdate every day from the svn repository of WordPress.
The main purpose of the blog is to test out my themes, plugins and hacks.
Besides these, I will also be putting other plugins, hacks and themes to the test. Consider it to be a mini sandbox.
I have user registrations open on that blog. If you are an author and would like to have your themes or plugins tested, please contact me.