I've compiled gftp for the n800. It's not nicely packaged yet, nor hildonized, but it works to graphically connect to SFTP machines, which I could never get the maemo-hackers file manager to do. The user interface is so-so on the tablet, but again, it works for now!

Instructions to install, since it's not packaged.
1. Download the tar.gz file below.
2. Unpack it on your tablet or on a computer to a memory card - you'll end up with two files.
3. Copy the gftp-gtk executable to a directory on the device, I'd suggest /usr/local/bin or /home/user.
4. Create a directory /usr/local/share/gftp, and copy the gftprc configuration file to that directory.
5. Run gftp-gtk from an X-terminal.

gftp-gtk-2.0.18.tar.gz