Uzilla -- "Heuristic Review is a process for expert review of web/software usability. uzReview is a Mozilla sidebar designed to facilitate this process. It supports the logging of heuristics against a URL or a keyword. The keyword facility is designed to allow the review of processes or workflows. Additionally, there's a rich text editor which supports drag and drop of content from the browsed pages for comments, ui improvements, etc." (Comments: Thanks Andy Edmonds @ Uzilla, LLC.)