Thank god you finally realized that :)

I'd rather learn js when I need to. Auto generation is waste time in this case

I dont know..

Tried some text. Didn't feel it did any summarization. Seems like it just grabbed one paragraph among full content. But I have no idea why that paragraph is most important.

waste time

Apparently you didn't use Rails, or at least on real project.

I really can not think of a promising reason to switch from 2.X to 3

Sometimes I feel that Python will end at version 3

railscasts.com

Great features. Now it really makes me to think about upgrading my rails 3 apps to 4.1