I have recently finished learning PHP and after getting familiar with AJAX and building a couple web aplications I decided I would like to learn to work with the diferent API's from websites like facebook, twitter, google+, google maps, youtube and amazon.
I found this book on amazon.com: Pro Web 2.0 Mashups witch seems to cover Google Maps, Amazon, RSS feeds and some others, but it is from 2008 and I tend to think that books that are older than 2 years from the current date are a little old. If that is not true please let me know. Although it really seems that it could be helpful I would like to learn them in the order I mentioned.
Can anyone recommend any books that cover the API's I mentioned?