Singular Software has launched the DualEyes for OS X public beta program. Winner of TV Technology's 2010 Mario Award for its breakthrough technology, DualEyes is a standalone application for the automatic synchronization of video and audio clips in dual-system audio production. Designed to work alongside any video editing application, DualEyes is streamlined to accomplish the task of replacing in-camera scratch audio with separately recorded high-quality audio.
The DualEyes for OS X public beta program is available for Mac OS X 10.5 and later, and can be downloaded here: http://www.singularsoftware.com/downloads.html.
My review of the PC version can be found here: DualEyes for Windows