Just added to Google's robots.txt file:

Disallow: /qnasearch?

Looks like it's for Google Korea's Q&A Search, the results for which link to various Korean Q&A website by the looks of things:

http://www.google.co.kr/qnasearch

Its search results are currently being indexed, hence the robots.txt update:

[inurl:google.co.kr/qnasearch]
http://www.google.com/search?q=inurl:google.co.kr/qnasearch&filter=0

Good pick tony, it's great :)