Sharonb at inaminuteago has started a postcard challenge for the year and I've signed up. There's no swapping involved, just post pics of your postcard on the Flickr site and/or your blog and provide a description about the techniques, inspiration and design issues.
This is something that I talked about doing this time last year but it never eventuated. I did a few for swaps and a couple for myself but nothing recordable. This time, with 6 x 4 lives, there might be a bit more incentive to do it.