Age-old Google Sets is one of my favorite Google Labs release. You enter two or so related terms and it will find many more terms from that group it derives. It's similar to the later released Google Squared program. Now , Google offers a search feature in the left-hand side bar titled "Something Different", and it's sort of like Google Sets has made it to the SERPs. Entering zebra in google.com, for instance, returns "giraffe", "hippo",