You can do http://tldr.it/summarize/?summary[url]=(your url). That's how the bookmarklet works. :)

And yes monetization is definitely on my mind. I have a few options. The first is as you mentioned Amazon stuff for the arbitrary URL's. Then there's also injecting ads into the summarized RSS feeds. Then there's also adding users and letting them have enhanced functionality for $x a month (i.e., update their RSS feeds on a regular basis, cutting free users back to once a day, make the bookmarklet a premium feature, and so on).

I really think this could be a good product; just not sure if I'll have the time to really develop it.