The monitored variables can be viewed in separate, floating windows.  Right click the main window or the tray icon and choose "Show in Separate Window."  For example, here's what the CPU graph looks like by itself:

Individual windows, like the one above, also have their own menus.  Right click the floating window, and you can change properties such as whether the standard Windows border is displayed:

The main three (CPU, RAM, and swap) also have "enhanced views," which show the data in time series graphs, like this:

The above is a screenshot of the CPU floating window in "enhanced mode."  The bar chart on the left shows the current CPU usage, and the moving graphs shows how that variable changes over time.

The Network variable is only viewable in an enhanced state.  Here's what it looks like as a floating windw:

Here, the current download rate shows 79 KB/s, and the upload rate is 8 KB/s.  The bar graph colors correspond to the time series graph to their right.  These colors are adjustable from the program's options.

Windows 2000/XP users can also enable alpha blending for these windows.  Users can also enable "variable alpha blending," which changes the window's opacity according to the current monitored value.  For example, you can set the floating window to appear 5% opaque when the CPU value is 5%, and 100% when the CPU value is at 100% usage.  This way you can ignore the program until critical values are reached.

Users of Windows 2000/XP can also make the background of the floating graphs completely invisible, showing only the edge of the graph and the graph's progress.  Just right click the floating window and enable "Transparent Background." (Note: this option is only available in "normal" mode, not "enhanced" mode.)