Quite a few - it costs a fortune in postage to send to friends overseas, but newsy chat is included and it's worth it to keep in touch. I always use up the left-over cards before buying a new pack and the village has a 'communal card' where you chip in a tenner and it is e-mailed around (surplus cash goes to charity). I also use an e-card firm which is very good, not sure if I can name it, Ja888i La**on, which at £10 a year is very, very useful.
No, I've not written mine yet and no, not worried about prospect of strike - people will have to understand and place the blame where it lies.