Jephe Wu - http://linuxtechres.blogspot.com
1. Perfect way - map sftp server as Windows drive letter
expandrive - www.expandrive.com (30days trail)
webdrive - http://www.webdrive.com/products/webdrive/sftpclient.html (20 days trial)
Directnet drive - http://www.directnet-drive.net/ (free for home user only) --it hung my Windows Vista Home Basic laptop
2. second option - ftp and webdav
Windows builtin functionality - map network drive for ftp server (lack of drive letter functionality)
note: choose tools/map network drive/signup online storage or connect to a network server/choose another network location, specify the address of a web site, network location or ftp site
or
netdrive - http://www.netdrive.net/ ( with drive letter and it is free for non-commercial use. )
or
Directnet drive - http://www.directnet-drive.net/ (with drive letter and it's free for non-commercial use)