Please don't do this. Google is already useless enough as is. New HN comments get indexed in like five minutes, but then they're gone in a month or two. Same with all content lately, it gets indexed really fast and then it's gone. It's gotten to the point where I'm looking for stuff I know exists and I know the keywords used on the page, and I still can't find it because Google just doesn't index that page anymore even though it's relatively popular. (For what it's worth, I was looking for a lecture that IIRC was submitted here a while ago that was basically a defense of pure math research in university.)

I actually used Yahoo! this week for the first time in a decade because Google just doesn't return good results anymore.