Gravatar addition to Avatar Plugin

I am sorry about the gravatar subject taking the other thread off topic. As was discussed earlier, I think it would be a nice addition to add gravatar support for people that are "not members" of your community as there are quite a few sites with many external comments that would be nice to not show the default avatar.

I agree with drmike in thinking that any "member" will be served the default avatar to encourage members to actually use the avatar plugin, but any "non-member" could be checked for a gravatar and if not, show the default avatar (since gravatars default really is not nice).

Does this idea work with what others are seeing with their communities and blogs?

Thanks for the time.