Hello! Thanks for submitting all the things! ;)
I made some edits after merging your work in, if you don't mind (e7bf85e). The only issue aside from some minor typos was the inclusion of some tutorials in the assets section. While it did appear to be a quality tutorial, the goal of that section is to maintain a list of tools and assets that support content creation or development.
I'd totally be open to maintaining a collection of high-quality tutorials once UE4 matures a bit more or further stabilizes! It can definitely be difficult to sift through all of the content out there considering how easy it is to gain access to the tools as well as share your work and experiences with them. That would be a separate list though, to keep the existing list focused on tools and assets as opposed to tutorials. (Popping in Tim Hobson's tutorial collection is totally cool though!)
Hopefully that makes sense!