Extensis recently http://announced that we are getting into web font delivery. Indeed, you can see Extensis web font tech in use on that page and throughout the Extensis web site.
In related news, we're also hosting a pre-conference http://cocktail party on Sunday, May 23rd at An Event Apart in Boston. You don't have to be attending the conference to come, though. Typophiles welcome!
Yes, we'll be showing our web font goodness at the party. :)