In short Viveza is a plugin that allows you to quickly and easily make selective adjustments to an image much like you would by using masking adjustments in Photoshop. As usual Uwe has a nice in depth review over at OutbackPhoto.com.
I wanted to see how it worked to make some selective adjustments to an interior image. I chose the above image of a master bath from a recent listing my wife has. Since I used Enfuse on this shot and didn't use a flash and the turquoise window shades gave the area around and above the tub a blueish glow that I wanted to get rid of. So I placed a control point on the ceiling above the tub and moved the blue slider on the control point around until I liked the look. Then since the left side of the room was not as bright as the right side I decided to put a control point on the ceiling on the left side of the room and pump up the brightness only on the left side. Wow, this is easy and fun! I can see why Viveza is so popular. It's really easy to quickly get results that it would hours to make selections and layer masks for. In fact, these subtle selective adjustments would take so much time any other way, I probably would never do them. I made a little before and after slide show of my changes to the master bath photo. I did this all in a matter of a few minutes with no manual, no instructions. I just downloaded the trial and started using it. It's very intuitive.
I am very impressed with Viveza, I'm going to learn more about it and start using it. This looks to me like a real estate photographer must have tool!