Leave no .DS_Store trails
Here's something I need for every Mac that I come across: disable the creation of .DS_Store files on network volumes. While these are needed on your local machine, there's no reason to litter someone else's computer:
From Terminal: defaults write com.apple.desktopservices DSDontWriteNetworkStores trueThat keeps us power users in Windows happy because we always have our hidden files showing. For reference, here are the big caveats: this keeps your local .DS_Store files intact and is only applicable for the current user.