Yeah , i did that 2 weeks ago ( played roullette with the robots.txt validator) and afterwards contacted them. They were actually very quick to reply and stated they fixed a technical issue and if not indexed properly after 2 weeks to let them know.
It is a good sign they at least are taking time to respond to some of the webmasters that contact them, Yahoo did as well recently.
The most consistent thing ive noticed is there are lots of authority sites that are usually top ten in Yahoo Google and Ask in the dark recesses with all fluff at the top except a few.
Right now I'd be happy just to be back there with them, at least you have a chance of climbing up again.