While I have no experience with this virtual curency technique, we have discussed this approach with respect to the barrage of emails that seem to plague the workplace, each mark 'urgent'. Seriocity, Inc.,(http://www.seriosity.com/home.html), has implemented this as an add-on to MS Outlook. The user may attach any number of 'Serios' to their email to get your attention. Of course, one has only a limited amount of serios, so opportunity costs must be considered; not every mail can be given highest priority. An interesting twist is that you earn Serios by replying to a message.