I did up an adventure for a computer game called "Azalta" long ago. It had game editor you could make your own ad-on's with. Gave copies to several people. Unfortuanately I no longer have it, do have Azalta though. And, I make up stuff all the time for the rpg game I run on Rpol. Varient AD&D game. I make maps, encounters and stuff. It takes place in a huge city that is Celtic as its history and was taken over by a Roman type government 150+ years ago.
If you want to follow some of the groups adventures you can go there and read the chapters that are currently up for all to read (some are missing).
Go here: http://rpol.net/game.cgi?gi=7901&date=1294965305
Read Here: "Notice: Story of Knu-Mythia (group 0)"
And at this moment I'm not accepting new players. There other things on that same page you can read about my world. It's been going since 1989..my world and games there that is. This current adventure started 2005 (I think).