Do you document your admin procedures? Tired of spending three hours learning how to configure something new or troubleshoot a problem, only to relearn all about it 11 months from now. Write the how-to in your own words so you understand it better.
We use MediaWiki servers for our run-books (site books). I'm not sure what "you" call them, but they are an invaluable asset to an aging team of developers and admin staff, like myself.
If you're not already using...