I'd really love to hear more suggestions on creating "hierarchies". I'm experimenting with Evernote as a permanent solution to my info management project, and not having a fairly intuitive way to build in a structure that mimics an outline format could very well be the showstopper for me. Which I would hate because I really love everything else about Evernote. And sorry, 10,000 tags is not enough for me IF that is the only way I can create hierarchies. (If Evernote really works for me, I would end up with *at least* 50,000 individual outline elements.) Stacks won't work because I need at least four levels deep for my projects. I have tried the "double naming" concept (Contacts-Work, Contacts-School, etc), but that does not truly express the nuances of why I use hierarchies in my research projects. I love how OneNote allows for infinite amount of hierarchal organization (which is really the only thing I like about it). Even a free blog on Wordpress allows for very complex hierarchies of "categories", so it's hard for me to believe such a concept is too difficult to do. I'm really surprised and sad that Evernote doesn't have some kind of more robust hierarchy functionality.