My finger gateway now supports much more of the Internet. It supports some sites specifically, like Facebook (try finger firstname.lastname@example.org@finger.afiler.com), but it also supports sites that have per-user RSS feeds linked to from the page at sitename.com/username (e.g. finger email@example.com@finger.afiler.com). It also supports queries on sites that have RSS feeds linked from their main page (e.g. finger firstname.lastname@example.org).
More finger feature suggestions are welcome!