Get a lot of comps from designers in PSD? Then have to either install Photoshop and look up sizes to implement it or just guess? This pretty neat tool from the creators of that format, allows you to easy get those values out of a PSD all online, even converts the objects to css (eg. the font-family to use, etc).

"BlueMasters is a dark, sexy, custom theme that has a solid, professional look and a very simple structure. You can access all files and layers used in a well organized structure and naming convention, making it easier for slicing the template or modifying it. BlueMasters can be customized to fit your business brand as well as your clients’ websites."