From the creators of WYSIWYG Web Builder:
FTP Wanderer 3.0
FTP Wanderer is a multithreaded FTP client with the look-and-feel of Windows Explorer. FTP Wanderer makes moving files between your website and your computer as simple as local file manipulation.
And best of all it's free software!
More details
http://www.pablosoftwaresolutions.com/h ... r_3_0.html