I have recently created a new blog at blogtest.info. I did this as much for myself as for others: I intend to use the site to test new WordPress versions, plugins, and themes before installing them on my other online sites. I will share what works and what doesn't.
On the blog, I envite your comments as well as requests to test plugins.
Because the site is brand new, there is not much content there, but what there is might already help someone with their own WordPress Installations.