Simplicity Linux is a Puppy Linux derivative with LXDE as the default desktop environment. It is based on Slacko Puppy, uses LXDE as its desktop and has Chrome as the default browser. If you are worried about your privacy, sign up for an account, otherwise it does nothing, and is completely optional. It's something we personally use, and have found really useful, so we thought we would bundle it.
Desktop is our heavyweight release. It features OpenOffice, Skype, Dropbox, and a lot of other software. If you do more with your operating system, this is the release for you.