I’ve been playing a lot lately with RoR (Ruby on Rails) and of course I love DIGG, hence I was very pleased to stumble upon a very interesting work by Patrick Lenz, which is a definitely cool and enjoyable free book (pdf) on how to build a full blown DIGG in Ruby on Rails from scratch!
I spent a couple of hours reading and trying, and I am already (!) building the app (or should I say building the DIGG) at this point of writing this post. The book uses Web 2.0 approach which covers a lot of Web 2.0 along the way – very cool! I highly recommend it to anybody who has the same passion, since it really is an awesome read!
Please hurry, as this book is only free (since the moment of me writing this) for "32 days, 14 hours, 21 minutes, 49 seconds" more, and I guess will blend in with many other books that we have to pay for once the time is up (currently it is $26.37 at Amazon).
For something "not very free", but "the best" on Ruby on Rails, there is another great book "Agile Web Development with Rails, 2nd Edition" that can be obtained, well, same place all other "not very free" books are obtained :) here.
It is not in any way an intentional advertisement for any of the links above, I am just so exited reading it, that I could not stop my self from sharing with the rest of the universe! ;)