The folks at the Personal Democracy Forum have a fine idea: "to get Members of Congress more aware of when the blogosphere is talking about them."
It's not hard: Just go to the Library of Congress site for a list of URLs. Then link to the member's official site when mentioning him or her in a posting.
There's more on the forum site including this link to a ranking of who's getting the most links. Understand, this is a fairly crude ranking, but it's a start.