MacProVideo:

The Clip-Based Gain feature in Pro Tools 10 provides a much quicker and visually appealing solution. Using the clip gain line you’re able to adjust the gain for individual clips and match their relative levels. You’ll notice right away how the waveform view updates in real-time to reflect the clip gain changes. Very impressive!

There are some great looking features in Pro Tools 10 — this is just one of them.