Heck yes. Huge ups on this idea.
As a writer, one of my fave things about Evernote is how a simple tag allows me to organize most everything to do with a given project in one place, research material included. The latter often includes things like 100+ page PDFs (with pictures) and recordings of loooooong interviews with sources/experts/etc. My life is fairly mobile; I tend to work on an iPad with a keyboard when I'm on the go, and inevitably, the bit of research I desperately need will be the big file still sitting on my desktop. Murphy's Law, I guess -- and that jerk never takes a holiday.
Please, Evernote! Help a sister out!