Update: If you are attending, check your badge here!
Gravatars now support resolutions up to 512×512 pixels. The higher resolution your gravatar image is, the better it will look on your badge.
For those attendees without a gravatar, an identicon will be included on your badge.
I’m excited to see these in print, I think gravatars will add a really nice touch to the badges, and it also shows they are useful even in the offline world.
I’ll be writing a tutorial on how to generate gravatar enabled conference badges very soon.