Review dropdown replacer

This extension for the Stack Exchange family of Q&A sites replaces the review button with a dropdown that lists all the review queues on the current site and the number of available posts to review. It simply saves the trouble of going to /review and coming back if there's nothing to review. It also adds a quick access to /tools (it doesn't check if you have 10k reputation, though). The extension does not collect any information.

StackApps question: http://stackapps.com/questions/4660/review-dropdown-menu