I just spent the past five minutes clicking through a press copy of PSFK‘s new book, Good Ideas for 2010, and being wow’ed/slightly jealous that I didn’t come up with these ideas myself. The book is a round-up of the best ideas PSFK ever put on their website in 2010 and the book is available to buy (or maybe add to this year’s wish list) here. One of the ideas in the book is Mystery Seeker, a Google-like search engine that gives you the search results for the previous user’s search. The results can be hilarious. Try it! But don’t be surprised if the previous user is a guy posting his e-mail. When I used it for the first time a few months ago, a lot of guys were using it as a way to find “casual online encounters” with girls.