There is an online demo of boilerpipe: http://boilerpipe-web.appspot.com/

I use boilerpipe a lot and highly recommend it. We've discussed it before on MetaOptimize: http://metaoptimize.com/qa/questions/3440/text-extraction-fr...

I ran a few qualitative tests on Diffbot's "Article API" and the results also look good. I haven't gotten a chance to run a detailed or quantitative comparison.

Nothing specific because it's really just a library, though I'm now considering this for the next version :-) However, http://coder.io/ leans heavily on it and all of the summaries and titles there come from it.