Thomas C. wrote in to let us know that EditGrid has gravatar support.

I’m always really excited to watch where Gravatar expands beyond the blog commenting space.  EditGrid seems to have seen the upsides of using Gravatar for profiles.  They don’t have to worry about writing and maintaining a cropper, file storage, serving infrastructure, backups, etc. All they have to worry about is their core business: making a killer web based spreadsheet application.