Chrome (Dev build on Linux) now allows you to select which extensions are still allowed to run in incognito mode. Before, all extensions where disabled.

http://sites.google.com/site/mrrix32/Home/blogoscoped/chromdevext1.png

http://sites.google.com/site/mrrix32/Home/blogoscoped/chromdevext2.png

http://sites.google.com/site/mrrix32/Home/blogoscoped/Screenshot-ConfirmRuninIncognito.png

that was added maybe a month ago

By the way, Chrome now prompts user what information the extension will collect when installing an extension.

they changed the layout a little. and it was there before