Indeed, with me doing my thesis research i at least have the resources of my University library and the wonderful thing called Interlibrary Loan. Yet, there are times I would really like to see a massive list of books, broken up into general subject headings, or a cross-referencable and searchable database of books with keywords, and summaries. It would make my life, and i suspect the lives of many others a great deal easier.
I recently acquired "Norse Mythology: A Guide to the Gods, Heroes, Rituals, and Beliefs" by John Lindow. I've not heard anything about the book, but it looks to be a reputable resource, since it is published by Oxford University Press. It is also far more current (first printing was published in 2001) than many other books I've been looking at. I figure, if the book turns out to be what I expect it to be, that I'll end up drawing on it quite a bit, at least in the introductory elements of my thesis...
Although it appears to be an analysis, far more literary than what I would prefer, it does from first glance have an excellent section on the gods. quite thorough, and since I'm about to re-read the eddas again as well as the sagas, I'm using it as a bit of a primer to refresh my memory to those Gods that are not so familiar to me. Heck, it has a sort of glossary type reference to the gods and references to them, such as Elli (ie, old-age), which is only mentioned once in all of our lore. (At least as far as I know.)
The last section of the book may be the most useful... it includes a listing of "print and nonprint resources" which is further broken down into subject topics such as women and gender, eddic and skaldic poetry, etc.