What I need. What would be great to have is a ssh/sftp file system driver for Windows. Currently to exchange files between my servers running ssh and my primary Windows machine I use WinSCP, and for remote access I use Putty (both programs are free).

What would be even more useful is an ability to mount the filesystem of a remote machine into a drive on Windows. Technically it's possible. Some operations (changing small parts of the file) would probably suck because I don't think the protocol supports the full i/o sementics so the filesystem driver would have to cache the file locally and every change would require writing the whole file out. It would still work great for file copying (and I could use any app I want for that and not be limited by what WinSCP can do) and editing remote files.