Every year I plan too, and every year I don't actually get around to it. The actual address issue is problematic for me as well. I probably only have house addresses for 20% of my friends, and I know that some of those are out of date.

Since we recently moved, I really want to send out some cards, but my track record is abysmal. So we'll see.

Also, I subscribe to the notion of the 12 days of X-mas -- so it's not really over until Jan 6. Those years when I have manged to send out cards, they go in the post that first week of January.