Pragma FortressSSH Server - Supports SSH1, SSH2, port forwarding, and SFTP. [Windows XP/2000/NT] - http://www.pragmasys.com/FortressSSHServer.asp
WinSSHD - An SSH2 server for the Windows NT/2000. Additionally supports secure file transfer with SFTP and SCP, TCP/IP tunneling. Evaluation version available. - http://www.bitvise.com/winsshd.html