SFTP Administration?

[Steve Holmes]

I know, this doesn't have to do with speakup but I have a question for
anyone who might have had some experience with Secured FTP (SFTP).  So
far, I realize that SFTP is a subset of ssh so I don't think any of
the conventional FTP servers like proftp have any chips in the deal.
I'm setting such a thing up on a private machine for my friend and
haven't been able to find much on controling access and rights.  What
I've done so far is to add users on this machine like any other shell
accounts but force their default directory to be /home/ftp instead of
/home/user-id.  I then put some symbolic links in this ftp directory
to point to the various download areas.  So far, the permissions look
good but I'd like to tighten things up a bit; I would like to "lock"
the users into the /home/ftp directory and subdirs.  Another rinkle
here is the sym links.  Once you cd to a symlinked directory, doing a
cd .. takes up from that point, and not back to where you were
before.  One big disadvantage to symbolic links, I guess.

Another question, are there any sftp clients out there for linux that
might be a bit better than the strait sftp command? I wish ncftp could
do it, but it doesn't look like it can.  Also many of the future users
of this machine are from winblows; what are some good sftp clients for
winblows?  Personally, I like FTP Voyager but 9.0 has SSL support but
does not appear to do sftp specifically.  I think it may be locked
into connectivity with their own server, Serv-u.

Any ideas on this stuff?