I have downloaded the pharobyexample.org ebook, but it seems out of sync with the latest release of pharo, also I would like to know about resources which can help me learn smalltalk.
While a bit outdated (or a lot :P), PharoByExample is still the best way to learn you can find around. You can download the image provided in the web page: http://www.pharobyexample.org/image/PBE-OneClick-1.1.app.zip (is not very visible, I'm sorry), and use it to learn... then you can jump to the latest version and you will find all you learned will apply with almost no change :)
You can find other sources to learn, but they are much more distant to the "up to date" versions you can find around: http://stephane.ducasse.free.fr/FreeBooks.html
You also can look around: http://pharo.org/documentation, there are some good stuff there (including links to Pharo by example, of course!).
Finally, you can also suscribe to [email protected] list... is a list where you can make any questions you want.