Lightroom 3 has a few great new features in it, but the best feature is the math behind the curtain. This is what Adobe calls a Process Version. It is essentially a new set of algorithms and other mathematic equations that I would never understand, that make our images look better. And all throughout high school, I thought math would never be useful to me. It turns out that it is very useful, as long as someone smart employes it in my photo software. Lightroom 3 can employ the older math from 2003 (used in LR 2) or it can employ the new math inherent in LR3. The new math is beautiful and worth updating images that you are taking a second look at, but