Could you please tell me about an online, informative book on translation?

Answer 1

I'm not sure what you mean about book on translation, but Wikipedia has a huge article on it:

http://en.wikipedia.org/wiki/Translation

As you see, the article is available in different languages.

If you're looking for an online TRANSLATOR, Altavista's Babelfish isn't that bad:

http://babelfish.altavista.com/

Hope this helps...