Thx--would appreciate you sending me queries that didn't work for you (if you can recall any you're willing to share): http://duckduckgo.com/feedback.html
Sure! While I can't recall any on the top of my head (I'll be sure to send you some if I come across it again - will make an effort to try again at a later date), it's usually more to deal with very specific technical terms. Maybe overly specific? Will report if I have any issues.
Always trying to improve!