I just released Speclenium 0.0.5.
One of the bigger stuff I worked on was setting up a proper tree diff view that allows the user to grasp quickly how the two accessible object trees differ. So here is an example page. It represents the accessible tree differences between Firefox 3 and IE 8 Beta 2. The page they are both rendering is an ARIA slider example.
I only tested this with Firefox, so it probably does not yet work on anything else. I also tested it with Orca, NVDA and Fire Vox.
Let me know what you think!