I recently discovered that piping can be used in conjunction with STSADM command. I always found it difficult to use that command. It has too many options and parameters that are not always obvious and often very difficult to use. Piping makes it easier to use STSADM command, it can be used for search through STSADM keywords in the commands: For example, stsadm | find "enum" can be used to find all STSADM keywords related to enumeration within SharePoint. Or, you can also use pipe | more to paginate the STSADM output, which could be very useful.
You can also redirect STSADM output using the redirecting command: stsadm > filename >& This can be very helpful when you need to generate an output and view it later, or if you need to export that output into a different application.
I realize it's very basic, but it's the basic things like this that help me save time and keep my sanity.