How efficient are you in Searching with Google?

Most bloggers need info / data / views to support themselves in their posts. Googling is indispensable. How much of an expert are you in Google search? To sahrpen your skills try: http://www.agoogleaday.com/ I enjoy solving search skills based puzzles almost every day except when I am hard pressed for time.

If you have tried can you share your experience? Which puzzle  did you find most difficult? What techniques did you learn afresh (unkonwn to you earlier)?