Have you ever wondered how many D&D products are out there? Why Holmes was BLUE, and Moldvay and Mentzer were RED? Why modules start out with strange letter codes? Whether there was life before 3rd edition? I did. But I wonder about everything.
You may not care. Or you may never find out. But if, if, if you have a craving for knowing D&D before 3e, Pathfinder or 4e, then you can probably satisfy your needs a long way by visiting the website of (once?) London-based IT specialist Mark Bertenshaw. His review listings are truly extensive.
Actually, they're even fun to read.