PS Quicktips Episode 66: Crossing the Process
Cross Processing has been a popular photographic technique for many years and with the innovation of digital tools the look of cross processed photos has become even more popular. There are many plug-ins and tools out there that will help you achieve an effect such as this, but all of those tools require more time and money than I am willing to spend.
Luckily when I was poking around in the curves dialogue box I actually found a preset that does a very nice job of "cross processing" a photograph. Add this as an adjustment layer and you've got yourself a kick-butt technique, and most importantly a non-destructive effect!