http://hntrends.jerodsanto.net/?q=pg
http://hntrends.jerodsanto.net/?q=y+combinator
http://hntrends.jerodsanto.net/?q=pg%2C+tptacek%2C+patio11%2...
http://hntrends.jerodsanto.net/?q=2007%2C+2008%2C+2009%2C+20...
http://hntrends.jerodsanto.net/?q=android%2C+iphone vs. http://www.google.com/trends?q=android%2C+iphone&ctab=0&...
http://hntrends.jerodsanto.net/?q=show+hn%2C+ask+hn%2C+tell+...
http://hntrends.jerodsanto.net/?q=mac%2C+gruber%2C+steve+job...
Don't forget thought that these trends include the user's own comments and submissions in addition to mentions of them in other users' comments.
suking, this is truly awesome. It immediately joined my bookmark folder of favorite HN tools. I'd be curious, though, if whether or not it would be possible to filter out user names when counting how many times a word has appeared on the site. Or would that be too much of a challenge?