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LymanJay, thanks for starting such a fun and thoughtful thread. I now know that my baseball card collection is only about half what it used to be. The other half is made up of non-cards. No worries, though. In all honesty, I would have trouble choosing which half I like the best.
Now that we have achieved non-unanimous agreement on the definition of a "card," perhaps someone could start a thread entitled "What is vintage?" I'm sure we can have an equally lively discussion (and of course achieve equally non-unanimous agreement) on that topic also. 
Happy Collecting (whatever you collect),
Lyman