ACS Publications has announced that they plan to partner with figshare in order to enable sharing of research data associated with articles. Figshare is a data repository which makes research data publicly accessible. Articles in ACS journals will link to associated data in figshare via a widget, and ACS plans to allow authors to deposit their supplementary data (SI) along with journal submissions. DOIs (Digital Object Identifiers) will be assigned to datasets so that they can be cited.
You can see the ACS/figshare portal at http://acs.figshare.com, and preview the interactive figshare data portal in this JACS article.
For more information, see the ACS announcement and the one on figshare.