Well, the defog one (I use 20, 60, 0) is something I run on every picture I keep. It just sharpens up your picture a little and well, defogs it. Just try it and notice the 'before' and 'after'.
And the settings I use to sharpen it for the web just kinda counteracts what "save for web" does to the image. I think "save for web" kinda softens it and desaturates it a little, so I usu. do an unsharp mask at 85, 1, 4 and then up the saturation to around 9.