According to Russ Beattie, an average of 3,700 "ad unit impressions" per day results in around \$111.79 in revenue. I recently added Google AdSense text ads on my Web pages, and will be interested in seeing the results, since I know that most people read this site in their aggregators.
Beattie generally talks about cellphones, which is probably a more income-generating topic than programming Tablet PCs and the ins-and-outs of the software development tools industry, but if just one person buys a Tablet via a click-through, I would imagine I could make a buck or two.