World Information Review posted a news article today on Web Citation Index . Here's the first paragraph:
"Thomson Scientific is releasing a single tool for searching and accessing online open access content. The Web Citation Index (WCI) from the abstracting and indexing (A&I) specialist will become part of its ISI Web of Knowledge platform and connect together pre-print articles, institutional repositories and open access (OA) journals..."
Web Citation Index was first mentioned early last year. Here's a February 2004 press release from ISI announcing their collaboration with NEC Laboratories America on the product and an a news article on Web Citation Index from Information Today from a month later.