This is MarkKramer's TrustRating, which is based on both the number of reviews MarkKramer has written, and how many other people have voted those reviews as "helpful." It's a way to quickly to determine the value of any single review or reviewer, because it's based on how helpful MarkKramer has been to the Kudzu community.
It was a pleasure working with Interchallenge! We used its localization service for one of our applications and enjoyed working together. Professional service and interesting experience overall. Thanks a lot!