Elsevier is now offering an automatic, free service to authors: By publishing in an Elsevier journal, the author will be notified, when his/her article has been cited when the citing articles have been indexed in Scopus. (Self-citations are not included.)
The service is called CiteAlert. Here is the press release: http://www.elsevier.com/wps/find/authored_newsitem.cws_home/companynews05_01115
A broader, similar service is been available to all Scopus subscribers, of which Princeton is one. On every page that displays an article’s bibliographic data and abstract, there is a link at the right that allows for subscribing to a citation alert.
Notice came via Knowledgespeak Newsletter, Jan. 30, 2009.