Fraser Hess launched his new Mac app last week that is called Particulars.
Particulars displays system information about your Mac on your desktop. It shows computer name, model, CPU, RAM, OS version, Server version, current user, uptime, disk space and network configuration.
Particulars provides up-to-date information and dynamically changes when your system changes. For instance, if you switch Wi-Fi networks, Particulars shows the new network configuration immediately.
Particulars does not replace your desktop background image and is responsive to changes in your screen or space layout. It does not require any scripts or need any complex setup.
Particulars supports many disparate network configurations including IPv6, manual addressing, multiple addresses, captive portals, PPPoE, and VPNs.
It's only $1.99. You can't beat that. You can purchase it on the Mac App Store.