Photoshop Tip & Trick
I seem to go through this about once a year. I'm not sure if I change something or if Photoshop just hates me. But if you are ever working with an image in Photoshop and it will look totally different after you perform a "Save for Web". then take a look at the small little dialog on the "Save for Web" dialog box. In there you should see a setting that says "Convert to sRGB". Make sure that's not checked. It should save you a headache or two.
*Note: I'm not a color profile expert, so this may have other consequences that I'm not aware of yet.