Just stumbled on this post at InfoQ on the power of checklists. It talks about a low-tech approach to improving care in hospitals, by writing down the steps needed in various medical procedures and putting together a checklist for each case. I've seen the power of this approach at my own company -- until we put together checklists with things we have to do when setting up various servers or applications, we were guaranteed to skip one or more small but important steps.
I'd like to take this approach up a notch though: if you're in the software business, you actually need to AUTOMATE your checklists. Otherwise it's still very easy for a human being to skip a step. Scripts don't usually make that mistake. Yes, a human being still needs to run the script and to make intelligent decisions about the overall outcome of its execution. If you do take this approach, make sure your scripts also have checks and balances embedded in them -- also known as tests. For example, if your script retrieves a file over the network with wget, make sure the file actually gets on your local file system. A simple 'ls' of the file will convince you that the operation succeeded.
As somebody else once said, the goal here is to replace you (the sysadmin or the developer) with a small script. That will free you up to do more fun work.