So, I've added Gravatars to the comments. Anyone who has one will now be displayed with a picture. At the moment though, the distribution of Gravatars is still a bit sparse - I find them kind of fun, as they make commenters somewhat more personally recognizable. Not just anonymous names in the background.
Since Gravatars are pulled based on the email address entered: this will definitely not be published by me. Gravatars use an MD5 hash of the email address, so the address cannot be reconstructed from the link. And besides, WordPress doesn't publish the email anywhere else anyway.
But if you still don't want to enter your regular address: I have 50 Google Mail invites left over. If you send me a message via my feedback form, you can get one and use that instead. Google Mail has a pretty decent spam filter and with 1 GB of storage space it takes a very long time to fill up if you don't empty it. Perfect as a throwaway account...
And if you don't want that either, you'll just get my default Gravatar and then you'll just look a bit pale.