Cyberduck (the excellent SFTP/FTP client for Mac OSX) has just released the first beta of Version 3 of the most excellent SFTP/FTP client.  Version 3 adds support for:

Amazon S3
WebDav
Apple Quicklook

Version 3 is looking like it will be particularly cool, especially the Quicklook and WebDav support.  Help out the testing process and grab your copy!