I like the idea but the implementation requires a bit of work. A lot of times the update list is simply not current for days on end, kinda defeating the purpose of having the updater in the first place especially for time sensitive security patches. Example being when Java update 17 was released, Avast still listed update 15 as the most current version for days. I also seen the same thing happen with Chrome and flash.
It shouldn't be that hard, there are a couple of RSS feeds which exist to notify people of security updates. If you don't use RSS feeds, Oracle and Adobe have specific emailing list that email you whenever there is a patch.