Qoppa Software (http://www.qoppa.com/) has released PDF Studio 10, an all-in-one PDF editing software for Mac OS X. The new version adds PDF Optimization, Overlay Comparison and Conversion to HTML5.
The Optimizer function provides options for users to reduce the file size of PDF documents before sharing or publishing them. Images can be downsized and compressed, unused and duplicate objects removed, and data streams compressed.
PDF Overlay Comparison view allows visual comparison of drawings and blue prints by overlaying two documents and highlighting the differences using complementary colors.
PDF Studio costs US$129. A demo is available for download.