BGInfo from Systernals allows you to show your computers configuration as a bitmap image on the desktop so you do not need to look up key information when troubleshooting the computer. Best of all, its free!
Quote from their website:
How many times have you walked up to a system in your office and needed to click through several diagnostic windows to remind yourself of important aspects of its configuration, such as its name, IP address, or operating system version? If you manage multiple computers you probably need BGInfo. It automatically displays relevant information about a Windows computer on the desktop's background, such as the computer name, IP address, service pack version, and more. You can edit any field as well as the font and background colors, and can place it in your startup folder so that it runs every boot, or even configure it to display as the background for the logon screen.
Because BGInfo simply writes a new desktop bitmap and exits you don't have to worry about it consuming system resources or interfering with other applications.
BGInfo works on 95 and higher, and Windows NT 4.0 and higher.
Click here to download or go directly to their website.
Related Tips:
Using Microsoft PorQryUI to Test for Open Ports
How to Find Your IP Address