Every once in a while, a truly useful piece of free vector art pops-up on the Web. VectorTuts has made available one of those must-have downloads in the form of Firefox and Safari Web browser windows, complete with buttons, location bar, scroll bars and other browser assets. The browser windows and elements are perfect for using as mock-ups for presentations, as well as dropping screenshots into for showing off your Web designs in your portfolio. You can also grab a set of really nice watercolor brushes for Adobe Illustrator while you’re there. Both the browser windows and the watercolor brushes are free of charge, and can be used in personal or commercial projects. You can download them exclusively from VectorTuts.