Currently, my group plays Dragonbane, which gives off the lethal vibe of D&D at low levels.
For the last 8 months, I've soloed BX 1981 (using OSE + Advanced OSE) to quell my D&D nostalgia symptoms. I run five characters (magic-user, fighter, cleric, thief and a ranger). I've used parts of BX and AD&D modules to create the adventures. Characters started level 3 and are now level 5 or 6. I have a few house rules, and since I'm The Soloist, no one can argue with me about my changes to the game.