Here are some of my favorite ideas and tutorials:
A Christmas Corkboard by House and Home
An Evergreen Urn by bhg
Since we have a fake Christmas tree (groan), I would love having a little evergreen around. Our local grocery store gives away Christmas tree clippings. I might have to steal some for this.
Christmas Card Jar Display by All About You
Photo Wreath by Decor8
(OK, I know that those aren't Christmas cards, but I couldn't resist including that beautiful wreath.)
Of course, Martha has to show us all up.
And here are a few tutorials that I am lovin':
Embroidery Hoop Card Display by Katydid and Kid
Shutter Card Display by Pretty Handy Girl
Picture Frame Card Holder by Sassy Sanctuary
And, here's a great idea of what to do with LAST year's cards (of which I have boxes and boxes!):
Christmas Card Runner by Real Simple
How do you display your Christmas cards?