Speaking of which, there's a new service called Repvine, which describes itself as "a platform for people to collect and share references along with a means for their sphere of influence to collectively validate the references provided."
Collecting references linked to their providers also makes sure that this more managed part of your online reputation scores relatively highly on Google.
Webby's World notes that "the difference between ClaimID and RepVine is that instead of acting as a bookmark service, RepVine does things such as collect references. RepVine allows you to ask your online contacts for references, however, in order to provide them they must sign-up for RepVine. Your contacts then build up references, and it all turns into a nice little circle of trust system."