Developer website: piDog.com
PDFast is a simple PDF viewer whose goal is simply to allow the fast viewing of PDF files. It doesn't print, thumbnail, zoom, or index. Just view. Just fast. Please note that large files will use lots of memory and may take a minute to render, but once rendered, they will be easy to view.
Version 1.0.2: Added a "Mail It" button to create a new email and attach the image to it.
Mac OS X 10.2 or later