Hi James: Excuse me if this appears to be a silly question, but, apparently this is available only for "static" study: Is that the study type you have? I found it in 2011, when I right-mouse-clicked on the name of the study in the FM tree.
First, Trend Tracker is available with Simulation Professional and above, so make sure you have at least this. There is a nice little tutorial on Trend Tracker under Help > SolidWorks Simulation > Tutorials and then choose the Static button, then TT is the ninth one down.
You access TT through right-click on the study name. I've added a button for it on the toolbar (don't think it is there by default) because it is so awesome.
After invoking it, then you have to set the Baseline, and then from then on it will do its work after each subsequent run.