Definitely a keeper!
"If you’re encountering application failures, operating system faults, or Stop errors in Windows Vista, you could have defective or failing RAM. Microsoft included the Windows Memory Diagnostic Tool in Windows Vista so that you can test the RAM chips in your system.
In this edition of the Windows Vista Report, I’ll show you how to launch and use the Windows Memory Diagnostic Tool."
Hat Tip: Milo, A Look Into Windows Memory Diagnostics