Never heard of this before. It's a nice thought, from your perspective. However, I suspect people who want to send you a card will do so, off their own bat, without any prompting. Otherwise, you are putting your friends under a bit of pressure to perform as expected, IMO.
If you do go ahead with this, include a self-addressed stamped envelope. You might as well go the whole way and make sure you get the note returned.
QUOTE (niggles @ 25/02/2013, 01:48 PM)
I'd avoid the phrase 'wish us well' as it's one that's become synonymous with the option of giving money instead of a gift and I don't think you want to imply that.