An often-requested feature of Mac Mail is the ability to tag messages with keywords. While full tagging ability isn't included in Mail, you can add colored flags to messages to help you organize them. You can even rename the flags to make them more useful. But for true tagging ability, you would need a third-party extension like MailTags.
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Gary,
I remember in the WWDC keynote a mention of tagging as part of Sea Lion (oops, Mavericks, lol), but can't remember if that applied to Mail, do you know?
Keep the valuable tips coming!
It was Finder tagging that was mentioned -- tagging of files and folders.