Optifine, in addition to making most peoples' Minecraft run faster, also adds a whole slew of ingame visual settings!
http://www.minecraftforum.net/topic/249637-Optifine

I HIGHLY RECCOMMEND OPTIFINE!
NOT ONLY DOES IT MAKE MINECRAFT RUN MUCH SMOOTHER, BUT ITS MIPMAPPING SUPPORT IS NEEDED FOR ANY LARGE TEXTUREPACK!

