Cloud mapping experiment. Contact [email protected] in the access logs
It looks like somebody's robot accessing the HTTP server on your machine. My gut says it's probably harmless. Searching Google for those keyword returns other people who are seeing it in their logs, too.
It's good to be vigilant and it's good to hear that you're watching your logs so closely. In this case, I suspect you're alright.
I think it is suspicious they have nothing about their company or their project on their site. To me it looks like a way to hide their scanning under a reasonable facade of respectability.