Hi there!
I'd just like to promote a little shader mod that I've been using recently, which is, in my opinion, prehaps the BEST shader mod I've ever seen.

Here's a little screenshot:
And a little GIF (Sorry about the chunk updating and the sky):

This mod, is known as Sonic Ether's Unbelievable Shaders. Based off of the original GLSL Shader mod made by daxnitro.
I will warn you beforehand though, you need a pretty high-end machine to run this mod well, otherwise, your Minecraft will just crash all the time, or you'll experience tons of FrameRate lag.
You will also almost definitely experience a massive frame drop. For me, I went from 300 fps on Vanilla Minecraft to a measly 20 fps after installing this mod. Optifine is recommended.

For those of you who would like to compare their specs to mine, here they are:

Processor: Intel Core i7 CPU 860 2.80GHz
RAM: 8GB , 2.1GB usable (I've been meaning to fix that for some time, but I can't be bothered :3)
Graphics Card: Nvidia GeForce 9800 GT

Not sure if that's all I need to put there :L

Anywho, I recommend testing out this mod. It's definitely worth it.
LINK: http://www.minecraftforum.net/topic/940974-125sonic-ethers-unbelievable-shaders-glsl-shaders-dynamic-shadows-more/

You will probably also want to use Optifine as well.
LINK: http://www.minecraftforum.net/topic/249637-125-optifine-hd-c3-fps-boost-hd-textures-aa-af-and-much-more/

If you're interested in Daxnitro's mod (mentioned earlier), here you go.
LINK: http://www.minecraftforum.net/topic/120261-125-glsl-shaders-dof-bump-mapping-waving-wheat-dynamic-shadows-and-more/

I claim no ownership of these mods. Just simply giving them a bump :D

Thanks for reading :3