We've been writing birthday thank you cards this past week. Actually #1 has been writing them himself which is lovely. After various melt downs and much frustration we've discovered that if he dictates to me I can write it down and then he can copy it. No more tears!
I think it's really important to write thank you cards to people who send gifts as we live away from a lot of family. We made a stack of them up before Christmas and wrote in them on the day! Kinda geeky but it was also quite nice. It made the kids think about it a bit and appreciate their gifts more too. I'm not very good at sending Christmas cards before the 25th. Most years I don't do it at all.