Our industry's leading authority on search patents Bill Slawski found another interesting patent submission. Apparently Microsoft is looking at, if not using, domain age as an algorithm factor.
This has been discussed in conversations in many forums and no doubt this new information will start them up again.
The idea that new domains will have to overcome this hurdle is a factor that marketers will have to consider when developing sites. Also the impact of inbound links based on age of referring sites will also come into play.