Ha, I had forgotten about that meme.
I actually... stalkerishly save people's addresses, and occasionally when I get the urge, I send random letters to the people whose address I have. Hopefully this makes them smile and not make them wonder if I'm a freaky stalker :P
I also keep a stock of cards that basically say *hugs* because it always makes me sad when people on my flist are sad, and I like sending mail to make them more cheerful. Although the stupid USPS returned the last two that I sent out back to me :S