$sudo apt-get install sshfs

Will install fallowing: fuse-utils and libfuse2
When sshfs is installed:

$sudo mkdir /path/to/mount/point
$sudo chown your-username /path/to/mount/point
$sshfs ssh-username@ssh-server.com:/target/dir /path/to/mount/point

Thats it. To unmount just type

$sudo umount /path/to/mount/point