It is quite easy to use. The interface is almost identical to a word processor; where the power comes in is that you can edit a document at the same time as multiple other users. Your changes show up almost instantly (i.e. as you are typing them) on connected users' screens. You can actually have a slightly delayed discussion with another user on the Etherpad while trying to hash out an idea or concept!
Each document is called a "pad". A list of pads is available once you log in at http://etherpad.trinitydesktop.org/ . Simply click the pad name to join the pad and start reading/editing it.
Hope this helps!
Tim
Okay, this is nuts.
I don't remember my account name. Tim or Robert can you find this information?
Darrell