This week's book giveaway is in the Agile and Other Processes forum. We're giving away four copies of The Little Book of Impediments (e-book only) and have Tom Perry on-line! See this thread for details.
Have you tried SproutCore and MooTools (in general, not together)?
What do you think about them?
I decided to combine both frameworks in one post in order not to create another debatable thread.