I have become not such a big fan of sending cards in the mail - honestly, the addressing, stamping, etc. process is overwhelming to me in the midst of the season of all the gifts, parties, etc. To simplify, we give cards to the people are giving gifts to, this kind of two in ones the process for me... if you are important enough that you get a gift, then you get a card too. this lets me feel a little bit better about spending a bit more for a higher quality folded card like this one:
theres also a lot of great deals out there right now on photocards if you look for coupon codes and free shipping codes! here's some other ones shutterfly has:
http://www.shutterfly.com/cards-stationery/holiday-cards
i also love that you can personalize it inside with family photos from the year... no need to stick in the tradional christmas letter, but you can type in a few highlights or i think some of them even have templates for a longer letter right there in it.
in intrest of full disclosure, I do get 50 cards from shutterfly for sharing this with you, if you have a blog and would like to get in on the fun, go here: http://blog.shutterfly.com/5358/holiday2010-blog-submission-form/