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Eric is right, a few European institutions have been doing this for several years. At the University of Bath we've been using ELIN http://elin.lub.lu.se/elinInfo, which Lund University in Sweden had been operating since 2001 (until recently - it's now been effectively spun off.) This is also what underlies the DOAJ site http://www.doaj.org/ It seems to me that there are two approaches to building these aggregated indexes: (1) load whole databases (mostly A&I) and catalogues, as an alternative to federated search, and (2) collect article-level metadata, mostly from primary publishers, to build an index of the library's e-journals collection, then possibly add the "print catalogue." LANL sounds like it's taken the first approach; ELIN and Journal TOCs http://www.journaltocs.hw.ac.uk/ are based on the second. The approach taken by the commercial vendors is somewhat blurred between the two, but I would suggest that EBSCO Discovery Service and OCLC WorldCat Local are broadly based on the first approach and Serials Solutions Summon and Ex Libris Primo Central are more focussed on the second. I think this is an important consideration for anyone selecting a service, or contemplating building their own. Laurence Lockton University of Bath UK