It's important to note that this is, at first glance, a different beast than the padmappers/3Taps issues, which were primarily about scraping craigslist data and placing it on a different site. Krrb has users press a button, which scrapes a given post.

The end result is the same -- the same data as Craigslist being displayed on a different site -- but this is coming from the Krrb users' own volitions, which I think makes this much more difficult to justify from Craigslist's point of view.

I honestly don't understand why Craiglist has taken this tack. I think the moves they've made in the past are respectable (as in, they have the right to protect their data and leverage their position) -- I just think there's more value to the company and the community to become the Amazon of local.