[chef] What do you use tags for?

[Larry Wright < >]

I was having a discussion today about tracking some additional metadata about 
nodes, specifically using tags to track some things related to ephemeral VMs 
like who requested it, how long it's needed for, etc. This got me to 
wondering what people use tags for. I've actually never used them for 
anything, but I suspect some people have come up with clever uses for them.

So… what do you use tags for?