Changelog
v04:

-Corrected SSAO and motion blur rendering together
-Added colored shadows to simulate direct and ambient light color
-Added waving leaves and fire
-Improved wind animation for all moving objects
-Corrected HDR flicker (by default HDR is off because of performance hit)
-Glare is disabled by default (can be re-enabled)
-Adjusted cross process
-Potentially fixed no textures error
-Various optimizations for performance improvement

Known Issues
This mod is somewhat incomplete and still has a few visual artifacts. These include; flickering shadows, sun shining through into caves, abrupt day/night transitions, seeing shadows through player's hand/tools, and some sky artifacts. Keep reading for tweaks on how to minimize some of these artifacts. I am waiting on an update on daxnitro's behalf for a fix to some of these issues as I am not fluent in GLSL.

Recent Changes
-Updated Shaders Only to 1.1.02, less jittering, easier configuration of shaders, better performance, subtle motion blur
-Updated Shaders Only 1.1 files for easier shadow draw distance adjustment.

About
This mod adds shaders to Minecraft in a post-process manner that simulate different effects that occur in the real-world in how light reacts with objects and with the human eye. This mod also makes tall grass move in the wind.

Note: This mod was configured with a high-spec system in mind. If you run vanilla Minecraft with max view distance and fancy settings at like 100+ fps and most modern games at med-high to high settings, then this mod should run fine for you. Read further down in the Tweaks section for how to get better performance out of this mod.

Installation
This mod requires OptiFine HD_A 1.1 preview version (in the top of the thread).

1. Download and install OptiFine 1.1 (preferably on a clean Minecraft.jar, if you've got a modded one already you can give it a shot but no guarantees this mod will work with an already modded Minecraft).

2. DOWNLOAD v1.1.04 (Windows) or DOWNLOAD v1.1.04 (everyone else) and extract the folder inside the archive anywhere (like on your Desktop). Open the folder, and run "INSTALLER.exe" (or nitrous.jar if you're not on Windows). Click "Install Mods", wait for the mod to finish patching Minecraft.jar. (To anyone with the "javassist.NotFoundException: a(..) is not found in adt" error, just right-click on the "1.0.0 line" in the Installer and disable it.) Once it's done, you should be all set! Run Minecraft and enjoy unbelievable shaders! But keep reading, for there are some tweaks you must make to your video settings to create the best experience!

2b. Make sure you have the latest and best shaders for you found in the Additional Files section below. Shaders Only 1.1 is updated more frequently than the main download and installer.

3. Go to "Options..." and make sure that your FOV is set to Normal (all the way to the left). Then open up Video Settings and then Details and turn off Sky if you want to eliminate shadows being drawn on the sky. Go back to Video Settings and then click on Other, and enable Smooth FPS. This setting will reduce input lag at the cost of fps, some may want this enabled. For better performance, turn graphics to Fast, and then re-enable specific features that you want to be Fancy in the Details section (like trees and grass edges). This gave me about a 7 fps boost even though most things look exactly the same. For some more performance tweaks (thanks to the great community!!) see here and here.