Last night we talked of the IBD site that allows you to track volume for the current session as compared to the previous session.

Go to the site:
www.investors.com/
Then enter the stock you are interested in on the right side of the screen. It takes you to a summary of the stock. The percentage volume figure it shows you is how much higher or lower the volume for the current session is versus the previous session. It also shows you the current volume and the average daily volume so you can compare those as well. Very handy.