Perfect timing on finding this. Currently I’m learning how to use OmniGraffle, a step up from using free apps, such as Cacoo and MindNode. So far I like it, as it’s pretty comprehensive, my Adobe Illustrator knowledge definitely helps with faster adoption of this program I think. Btw, if you’ve come across any good tutorials for tips and such, let me know, it would be much appreciated. Learn. Learn. Learn. 🙂