Nice tool, can be quickly installed using "yum install tree" on centos / fedora etc.
One point to note, when using a putty shell you can use the -A switch to print ANSI indentation lines. Otherwise you could end up with a bunch of unreadable junk, like so...
"âÂ Â âÂ Â âÂ Â âââ prev-horizontal.png"
(also -S prints ASCII)