The World Wide Molecular Matrix (WWMM) is an electronic repository for unpublished chemical data. WWMM is an open collection of information of small molecules. The "Matrix" in WWMM is influenced by William Gibson's vision of a cyberinfrastructure where all knowledge is accessible. The WWMM is an experiment to see how far this can be taken for chemical compounds. Although much of the information for a given compound has been Openly published, very little is available in Open electronic collections. The WWMM is aimed at catalysing this approach for chemistry and the current collection is made available under the Budapest Open Archive Initiative (http://www.budapestopenaccessinitiative.org/read).