If you use Perfmon, it can get really old looking at all of the vertical lines in the graphs.  Here is a tip that will revert back to the old view we had in the NT4 days.

283110 Vertical lines are displayed in the Sysmon tool that obscure the graph view
http://support.microsoft.com/default.aspx?scid=kb;EN-US;283110

Also, if you would rather see that you have 2,000,000 MB of RAM instead of 2000000, you can add another registry key that adds the commas.

300884 HOW TO: Display Comma Separators in the Windows Performance Tool in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;EN-US;300884