I suppose this falls into the category of "stupid tricks" but I still find it useful sometimes. I created a simple alias called vid, which I use to create and edit a file with a date as part of the filename.
I find it handy for repetitive reports and memos.
The alias looks like this:
alias vid "vi \!:1.`date +%m.%d`"
and given an argument like memo or status, appends the date as an extension. Using wildcards, I can then list all my memos of a particular date or a particular subject:
ls status*status.02.18 status.03.10 %
ls *3.10budget.03.10 status.03.10