Panic today announced the availability of Unison 1.5, the latest release of the company’s Usenet newsreader for Mac OS X. Version 1.5 adds a number of new features, including a “significantly” faster and less memory-intensive article storage system, the ability to mark anything as “read” (including files), a Mail-like Rules engine for automatically filtering posts, an improved Download manager, switchable personalities, and more. Unison 1.5 is priced at US$24.95 and requires Mac OS X 10.2 or later. A free demo is available.