This thread might be helpful to you, where I describe in more detail what is with the Plus version - http://www2.ambientdesign.com/forums...ic.php?t=11986
There are similar tutorials available on the forums, just in the forum thread layout rather than .pdf ( see the Tips and Tricks forum ) and you can download the quickstart guide in html format from www.artrage.com/artragetutorials.html. The manual is also available in pdf format as part of the version you download. While the CD version comes with 16 extra stencils and some tracing images, a large amount of similar content can be downloaded from other users from the Art Supplies forum.
I'd say the main reason to purchase the CD version is if you want a physical product with a paper manual. If you get the download version, you can always back up your downloaded ArtRage installer, together with your registration key to a CD so that you have a physical backup copy. If you lose your installer, you can also download from us via our support page at http://www.artrage.com/ar2support.html