I would have to say that my new favorite tool has to be SSHFS.
I stumbled across it earlier this week and it has quickly become an essential part of my daily routine. It uses FUSE, a user space file system framework, to log into a SSH server and mount the directory locally.
It gets the job done and is extremely easy to use, just issue the following commands:
sshfs -o idmap=user serveraddress: ~/mountpoint
fusermount -u mountpoint