Alright, Scott, you're on.
Since most of the stuff that I've been using for the Motherlode game has come from other blogs that I've read over the past few months and not in-store purchases, I'm going to choose five (5) things to game with from there. As said before, we're using Swords and Wizardry. I really like the streamlined Saving Throws and the way that Ascending AC and To-Hit bonuses are already worked into the text. As someone who started out playing D&D in 3rd Edition and is running a game for people who've all played 3rd Edition, it's a good place to start for that base old-school feeling, but with some tweaks that make it easier for me and my players to accept.
So, without further adieu...
1) Beyond the Black Gate's Thief Class: Probably my favorite iteration of the old-school type thief class. The single Thievery percentile skill both simplifies the classes' multiple skills issue and helps 1st level Thieves feel a bit more useful.
2) Jeff Rients' Deck of Stuff: I love this fucking thing. The random items that they drew helped my players flesh out their character, whether it was giving them a flavor (like the wheel of stinky cheese convincing Joe that his half-elven magic-user was 250lbs.) or was something that they could use in a pinch (Mike's silver dagger, which he hurled into a crossbowman when he realized that he didn't have any other ranged weapons)
3) Jeff Rients' Carousing Rules: Because that's the kind of silly shit that I want to encourage in this game.
4) Tales of the Rambling Bumbler's Super-Simple Combat Maneuvers: Literally, the best way I've ever seen to adjudicate called shots, knock downs and the like.
5) Trollsmyth's Shields Shall Be Splintered: Makes having a shield totally awesome.
And to top it all off, liberal application of my newly acquired copy of the Moldvay Basic box set.
Everything else, from here on out, is going to be pure me.