N Wright over at Lawful Indifferent has released a brief Labyrinth Lord adventure called Servants of Plague. You can download it for free (I LOVE me some free stuff) - there's a link at the bottom of this post or, maybe better (if he tracks traffic or whatever), from the Lawful Indifferent blog itself.
Servant of Plague is a pretty good intro adventure - nothing too surprising in the setup or the setting - but a nice twist on the monsters faced. No surprise that disease plays a role in the adventure here, and the PCs might find themselves on the wrong side of a save in these confrontations. One of the diseases appears to be likely fatal unless cured pretty quickly - but that's no condemnation. It's more survivable than save or die poison, I guess.
The best part of the adventure, for me, is the notes at the end. The DM's Tips section provides some pretty standard advice (this is intended to be an introductory adventure - presumably for both the DM or the players) - but good reminders nonetheless - monster tactics, reminders of the openness of the fortress, that combats don't happen in a vacuum, etc. This is followed by "Continuing On" which gives suggestions for expanding the adventure at the fortress, reinforcing the fortress, what might have happened in the village while the PCs were gone. Every suggestion inspired possibilities for me.
This is a good brief module with some nice twists on the standard low level monsters usable virtually out of the box (um...off the printer?) with any "old school" D&D ruleset or retroclone.
Go get it here: Servants of Plague.