I'm kind of mulling this over right now. I'm in the same town as the cong of JWs that I DA'd from. I've been here since 1990 or so, so a lot of history. I would LOVE to send them out (they're all addressed...not stamped) to show them that I'm happy. :) They'll think, like you said, that I've 'fallen that far', but I don't really care. I'm still deciding my *reason* for sending cards -- to genuinely express Xmas greetings (I sent about 80 to non-JW, so it's not like I'd be singling out the JW) or to kick them where I know it will hurt them. I think I'm leaning towards the latter, so for that reason, I probably won't send them. I'm trying to be positive about this whole escape from the cult thing -- enjoying my new life, being happy, guilt-free and so on. And doing something I know is really, deep down, negative, sort of goes against that.
As well, if I were to send the cards, they would tell the ex and then the ex would crawl all up my kids' butts and not mine. Which I think is just plain mean and stupid (the kids are 9-13). I don't want them to go through that. (theyr'e going to get enough of an earful tomorrow when the ex comes up to my town to take them out for lunch and sees my decorations and the breeding-when-I'm-not-looking pile of presents under the tree).
So, although I'd love to send cards and within a couple of them, a special note (a 'thank you' to the elders in my JC that showed me the 'love'... for without that 'love' I'd have never left?!), I'll probably just toss them and leave it alone.
Your situation is a bit different though. You're 1500 miles away from those you'd send cards to, so I'd say go for it. :)
~merfi