thank you notes

So.....just throwing this out there; has the art of writing thank you notes completely gone out the window? I was raised to show appreciation for the thoughtfulness of others and do so by writing THANK YOU NOTES for gifts and placing them in the mail. I am raising my boys to do this as well. I know that I'm not the only one that still does this because I have received some very nice ones from friends and family, but is this no longer etiquette? I'd even be happy getting a THANK YOU email. I think it's just a classy thing to do! I know we are all busy...but come on people!!