Thats true. AFAIK ui tabs (the base for my tabs widget) doesnt support this yet.
I will check if the jQuer UI Team plans to support this feature. If they dont i will take a look.

Sorry, im still too busy, but i keep it in mind.

Not a problem, I totally understand!

There is some movement:
Same request for the Lightbox (http://github.com/fnagel/jQuery-Accessible-RIA/issues#issue/25)
Hans Hiller contacted me, my tabs widget modifications will be built right into original jQuery UI tabs widget. I will try to make a feature request for browser history support.

jQuery UI Team will support this feature (not sure if AJAX mode only):
http://jqueryui.com/demos/tabs/#Back_button_and_bookmarking

As there is no movement within the jQuery UI wiki, the old google svn and the new github svn i plan to implement history / back button support within my widget.

More info about history in Wiki: http://jqueryui.pbworks.com/History

As far as i can see it would be a nice idea to use a already further developed history plugin.

http://www.asual.com/jquery/address/ seems to be very nice working solution with many features.

http://github.com/tkyk/jquery-history-plugin is another option, but seems to have problems with manually changes of url and does not support title changing.

As there is a existing, but ugly solution to integrate Tabs with history (please see http://www.asual.com/jquery/address/samples/tabs/), I would try to integrate jQuery Adress as an option into my UI Tabs Widget Addon. This way it would be easy to use. We'll see if the solution will fit.

Any suggestions?

http://www.asual.com/jquery/address/

Working title and history support via jQuery Adress.
Please see latest commits (demo pages did not update -- again) and Wiki.

I wrote a blog post about this issue:
http://www.felixnagel.com/blog/artikel/2010/06/06/jquery-aria-with-browser-history-support-tabs-lightbox-and-sortable-tables/

Coo!