Organasm is an excellent intro into Zion aid climbing. At just 4 pitches, it's half the commitment of nearby neighbors Touchstone Wall and Spaceshot. Furthermore, pitches 1 and 4 may be free climbed at a modest 5.8 and 5.7, respectively.
P1 (5.8) Free climb 5.8 crack up pillar, past a single bolt, and continue through awkward wide section to gain a decent stance at a sling belay.
P2 (C1) Aid through a stellar roof through a splitter crack with bomber C1 placements. The crux of the route is probably cleaning this pitch, so be sure to read up on cleaning roofs BEFORE attempting (better yet, get some practice at your local area)! Continue past roof to a bolted anchor.
P3 (C2) A fairly long (150'?) pitch. Aid through second (smaller) roof and out onto arête. Straightforward nutting and good cam placements up this vertical crack, which ends on a nice ledge with bolted anchors.
The use of cam hooks should be avoided for soft rock areas such as Zion due to potential to damage the rock.
Descent
Descend to climbers' right via bushwack through gully to the north. Although fairly straightforward by daylight, just finding the descent gully would be difficult in the dark. Come prepared: bring a headlamp (and don't forget to check your batteries).
If pressed for time, retreat is possible from the top of pitch 2 via one double-rope rap.
i know for a fact that the 2nd pitch(the big roof) goes free at wild 5.11ish hand jams. and ive heard the 3rd pitch goes free at hard 5.11 or 5.12.
pitch 1 and 2 can be linked with a 60m rope(or less) but can cause quite the rope drag.
also, you can rap off the top of the roof pitch(the 2nd pitch) with one 60m rope(just barely).
By Dustin Wildermuth From: Sprindale, UT Mar 24, 2006 rating: 5.8 C1+
The gear beta posted here said bring cam hooks. DO NOT BRING THEM! You will not need them and you will destroy the route for future climbers.
By Gaar From: Springdale / Zion UT Dec 12, 2007 rating: 5.12b C0
This whole thing goes free at 12b....the roof is an easy 5.11.. NO HAMMERS!!!!!!!!!! Be Carfull of your rope getting stuck turning the lip, either free or aid... Recommend Building a hanging anchor right after the roof, and breaking pitch 2 up.