TSW SiteSync

From TSW:

With TSW SiteSync, you can keep a local and a remote version of your Web sites in sync. When you use SiteSync, you are always in control. Define your website once, and tell SiteSync if your content should be synchronized both ways, or only one way (download or upload). By defining exclusion rules, with both wildcard and regular expression support for folders and files, and by going through a 2-step procedure when synchronizing, you always know which files are transferred, leaving very little room for mistakes. TSW SiteSync even comes with a built-in FTP client with all the most common features, allowing you to do manual uploads and downloads as well as maintaining your remote version of the site. With the mini editor you can make modifications to both local and remote files, and get them synchronized on the fly. If you're even in doubt whether to replace a local version of a file with the remote equivalent, TSW SiteSync let's you do a visual comparison, using a cool "diff" interface. Version 2.0 includes unspecified updates.