This is silly, and I'm a sucker for silly, so at James's orders, here's Hot Elf Chick welcoming you to the OSR:
If you don't know what the OSR is, it's old school D&D gaming - using original D&D, 1st/2nd edition AD&D, or Basic/Expert D&D. Stands for "Old School Renaissance". You should go play it, and not just for the make believe hot elf chicks.
I mostly post about my campaign and how I design my mega-dungeon. I don't do any talking about what the OSR is or isn't about. For commentary about old-school gaming, go check out Grognardia - the most popular OSR blog.
There are also clones of the old games out there, which you can download for free if you don't have the original rules.
OSRIC is a clone of 1st edition AD&D. You can get it here.
If you're more of a Basic/Expert kind of person, you can download Labyrinth Lord here. The "Advanced Edition Companion" of Labyrinth Lord gives you rules to play it more AD&D-like than Basic/Expert-like.
If you want a clone of original D&D, Swords & Wizardry is the thing.
You can also pick up the old rulebooks off eBay dirt cheap.
Best of luck!