Desktop Manager allows you to switch between multiple desktops creating more elbow room for those who like to stay organized while pushing the max thread limit.

1. First grab XP PowerToys from microsoft.com (http://www.microsoft.com/windowsxp/pro/downloads/powertoys.asp)
2. Once installed right click then check: task bar > toolbars > Desktop Manager

You may now view up to four new desktops. I prefer not to have "Shared Desktops" on as it reminds me more of linux (and is cleaner).

Now you may hide the buttons etc. and use Windows key + 1-4 to switch between desktops and Windows key + v to preview.