I mostly right little software programs to analyze and organize my research data. I tried Lion on my backup computer and I think there are a lot of great new APIs that developers will take advantage of. However, Mission Control really, really sucks at displaying content if you have more than two windows of the same application. It is worse than Vista's Flip-view thing. My questions are: How hard would it be to develop my own little Expose/Spaces application? Maybe something that mimicked 10.6 Expose, which had a pretty simple grid layout. How deep into OSX do you need to get in order to control and move around other applications and windows? Would any of you be able to roughly point me toward the correct Developer's Guides?