They're not full blown "copy & paste" setups, they just show the basics and leave the rest up to the designer.
If your internet browser actually opens the TXT file (instead of downloading it)... come back to this page, right-click on the link, and chose 'Save Target As'.
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Added March 2010:
Chasm.txt - cross a "chasm" of pits by throwing over a grappling hook.
DM2 weather.txt - how the DM2 weather system was built
Door smasher.txt - break a given door with a given object
Multiple pressure plates.txt - place set number of coins on correct floor-plates to open a door
Poisoned fountain.txt - poisonous water from fountain
Rotating teleporter.txt - teleporter that rotates with a switch
Added March 2011:
Damage without item.txt - damage party if they aren't carrying a certain item
Item in alcove.txt - demonstrates basic alcove mechanics... in order to place flooritems on a wall, create the flooritem on a blank floor tile and copy/paste it onto the desired wall (the fake walls are so that no warnings come up on RTC startup)
Unlockable chests - only a certain key can open a certain chest, also shows each chest having a different "failure" message, and a different opening sound effect
Switches.txt - shows how to do certain tricks with switches
Added May 2011:
Variable Lockpicking - demonstrates lockpicking based on Ninja level
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Added December 2010:
Change_shooter_type.txt - the floor pad starts the sequence, after that, use the lever to change shooter type
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Added November 2012:
Random Weather - random weather simulator, all information included to copy and paste to a dungeon