I have set up a coupon on CreateSpace and Smashwords for Black Friday and Cyber Monday, and heck! Why not the whole weekend? November 25-28th you can get my ebook for FREE and my print book at cost. Stay tuned for my post of the coupon codes on the 25th!
And here is an excellent list of reasons I found on the Tag Surfer on why you should publish an ebook:
http://sellscompareprice.wordpress.com/2011/11/17/29-reasons-why-you-should-become-an-ebook-author/
Kate Policani 
I am glad I published my ebboks. What an education it has been, in a good way.