Fortunately it's easy to set up your Valentine's Day cards in advance -- today, even. You can create the ecards now, and Care2 will send them on the 14th of February. Just enter February 14 (as 02/14/2008) in the appropriate field in the Delivery Options panel:
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Here's my favorite V.D. ecard from Care2:
Worst Valentine's Pick-up Lines in History
"Are you a parking ticket? Because you've got fine written all over you."
Ouch.