Magento

I just bought php|architect’s Guide to Programming with Magento, it really helps understanding magento better on the programming-part. I’m looking for some learning material on the design-part too, unfortunately i didn’t find anything except magento’s little guide to design and some helpful topics on this forum. Does anybody know if there’s a magentodesign book out yet, or if somebody is working on it? Magento’s template structure etc. is not hard to understand, but i like to read about more indepth information about the structure.