Well, it didn't take long. Wired's Gadget Lab blog has a story about how a group of about 250 Kindle owners are staging an online protest over Kindle e-books that cost more than $9.99. The weapon they're using is Amazon's own tagging system, as price offenders are getting hit with a special "9 99 boycott" tag.
The roving--and most likely growing--band of annoyed Kindle owners includes such folks as Connecticut librarian Crystal O'Brien, who spends "a few minutes every day in the Kindle book store tagging the more expensive digital books with the '9 99 boycott' tag and removing it once the price drops below the threshold." Bookchase.