Sonar 2.0 is a utility that displays real-time information about changes made to a user’s hard drive. It is useful in monitoring untrusted applications downloaded from the internet and for debugging system slow-downs caused by runaway applications that write too frequently to the disk.

Licensed users of previous Sonar versions can download and use Sonar 2.0 at no cost. New licenses are available for purchase at matterform.com for $17.95

Sonar 2.0 is now compatible with Mac OS X version 10.5 (Leopard). It is expected to remain compatible with the soon-to-be-released Snow Leopard, Apple’s new OS scheduled to be released later this year.

Matterform also publishes Yank, an all-purpose uninstaller that uses Sonar technology to monitor software installations. Yank 2.0 is currently in beta-testing and will be released sometime this summer.