Anybody that knows me for any length of time discovers that I despise greeting cards unless they're hand-made. When I get a greeting card I read it and immediately trash it.
E-cards are even worse. I usually don't even follow the link to read them.
Today I received an e-card that was the exception. Cirque du Soleil sent me a birthday e-card. Even though I suspect it was just a robot database trigger sending me the link there was still somebody in the organization that said "Hey, we already gather this information why not use it for something other than data warehousing?"
I don't know..I just thought it was a nice personal touch from a group that never ceases to amaze me.