I just wanted to share something that I've been using a lot since I discovered it. If you're using standard max cameras but want the control over white balance that you get from vray cams then Adobe Camera Raw is a great tool for this.
It works just the same on jpegs as it does on RAW files, I use it all the time for general colour corrections as it gives you amazing control. Just right click your image in Bridge then choose 'Open in camera raw'. The white balance sliders are way more intuative than the colour balance tool in Photoshop and the HSL sliders let you tweak individual colours too.
