I haven't done benchmarks yet but if you are looking for HandlerSocket benchmarks http://blog.creapptives.com/post/3329352663/the-nosql-dogma is the link

Those benchmarks are very flawed as HandlerSocket only works in InnoDB. This is a better post on the subject: http://yoshinorimatsunobu.blogspot.com/2010/10/using-mysql-a...