I am going to ASTD TechKnowledge® 2010 in Las Vegas next week. This year, ASTD is "going green" with paperless session materials (handouts) for concurrent education sessions. Options were PDF, Kindle, iPhone and other mobile devices. I used the Kindle option - mobi file loaded easily. Very cool.
If you can't make the conference, ASTD is offering a "virtual" version at a reasonable cost.
Check it out: http://www.tk2010.astd.org/