E-book versions would be great. I have the audio version of both GTD and RFA...it seems my commute time is the only time I have to "read".
One thing I've done (since I often don't have the time to read many of the articles here in one sitting) is to dump new articles to either a pdf file (there are shareware programs that will "print" pdf files) or to e-book .lit files (Microsoft has a free Word plug-in that will turn Word docs into .lit files). Then I can catch up on the messages when I have time no matter where I am. I've also done the same thing with the Barns & Noble GTD course...not as good as being a "real time" participant, but I do get a chance to read the articles/messages this way!