In the interests of sharing the love -- recommend a D&D resource you think is awesome, but which maybe not everybody has heard of. Maybe it's a book, a blog, a web page, an accessory, an electronic tool, a prop - if you use it in/for your D&D game, let us know what's awesome about it. Try to keep to things you have no involvement with though!
So, what awesome D&D resource do you think more folks should use?
So, what awesome D&D resource do you think more folks should use?