We have developed two software plugins for the Mac OSX operating system that allow rapid and convenient visualization of PDB files and X-ray diffraction images directly within the file browser, without the need of full-featured applications. We have just published a paper describing this work:
Shown below are views of a folder containing PDB files. Shown on the right is a Finder window of a folder containing PDB files with the PyMol rendered cartoon thumbnail. On the left is a QuickLook popup of the same PDB file using the Jolecule viewer.