There’s a new, seriously cool feature currently being tested on Google, called Google sets. You name a couple of items and Google will attempt to expand that and find more items matching your examples.
Starting with “Bill Clinton” and “George Bush” might give you a set of american presidents while “apples”, “pears” and “bananas” gives you a list of fruits.
Let’s say you’re a fan of Open Space Technology and Appreciative Inquiry and you want to find more tools like them – well here’s a possible answer. Google rules!