ProofHQ is a collaborative tool for reviewing creative projects such as photography and graphic design. The tool allows you to upload anything from a PDFs, PSDs, and JPGs to Word and PowerPoint files up to 75 MB. The functionality is a bit like a mashup of Flickr and Skitch. It allows users to annotate, mark up, and comment on the work. The art can be embedded into a web site with the provided embed code.

Here's a test mini proof using the original design comp for Konigi to show the tool in action. Mark it up to see how the tool works. Ideally you'd be able to embed proofs into whatever project management site you have set up.