I don't really have a full post, but I have been sitting on this link for a while. It's a page dedicated to compiling remixes of video game music. The archive is massive and growing all the time. I particularly like that you can sort by system and by game.
The above video is a remix of the main theme of A Boy and His Blob. I chose it because it's a great remix, and A Boy and his Blob is sort of our 'patron nes game' here at Two Boys and Their Blog. (get it?)
Give it a listen, tell me what you think.