BgInfo is a free portable tool which displays a host of system information-type data on your desktop every time it runs (there's no real-time monitoring, you'll need to run the program again to see when something has changed).
By default this includes your IP address, DNS server, default gateway, domain details, user name, hard drives, free space and more.
Some of these details (CPU type) are really only interesting for technicians who'll be using BgInfo on many different PCs, and others will be meaningless to the average home user.
But fortunately it's easy to delete items you don't need, and customise the rest. If you're particularly interested in your IP addresses, for instance, you can display those in a larger font than everything else.
There's also a vast amount of control over the positioning of this data. If you don't like the default bottom-right placement, you can move it to one of eight other screen positions, or - on multi-monitor systems - display the data on any one, or all of your screens.
Perhaps most interesting, you're able to set up BgInfo to display custom information of your own: a Registry value, WMI query, environment variable, the contents, version or time stamp of a file, or even the product of a VB Script.
This update to BgInfo, a utility that adds system information to the desktop background, fixes a bug that prevented the standalone 64-bit version from working.
A simple, lightweight and super-configurable system information tool.