It's been a long-time wish of mine to be able to perform double-jumps as in other games, notably Castlevania: Symphony of the Night. So, I tweaked some bits of a script found in Maddog's Fantasy Mod [http://planetelderscrolls.gamespy.com/View.php?view=oblivionmods.detail&id=2561] that were used to make an unused, flying Halo vehicle.
The end result is that I've put a script on a necklace (called the Leap Stone as homage to CSOTN) that allows the wearer to double-jump. The ability is also leveled to your Acrobatics skill, so a Master can jump over five times before hitting the ground (but you'll still take fall damage if you're not careful).

UPDATE: Now in action here:
http://youtu.be/RVTfhU3iHKk

More detailed instructions are included in the download, but by default I made ESPs for the default jump key [E] and my own preference after years of PC gaming [Spacebar], but it's not hard to change to some other key. Instructions for doing so are in the description, as well as the values corresponding to different keyboard and numpad keys.

##Releases
v1.0 release version, six ESPs (three for E & three for Spacebar as the jump keys), with either leveled or fixed jump levels.

##Known Bugs##
I made the magic-circle-platform dealie have the textures contra-rotate around where the player would step on it, but this seems to only happen in NifSkope. In-game, it's just static.
I should point out that when re-equipping the Leap Stone, or entering an Interior cell, the magic floating platform might not align itself properly with the player's position. Removing and re-equipping the necklace usually works almost immediately, but if that doesn't, saving and restarting certainly does.

Lastly, if anyone has any improvements to make to it, please do; I'd love to see what improvements can be made.