DSpace follows (not quite "leads"!) EPrints in providing access (not quite "Open Access"!) to research during publisher OA embargo periods (via the facilitated Request-Copy Button):

http://duraspace.org/node/2133
Just in time, I hope, to help shape the implementation of the US Public Access Policy by ensuring that mandatory deposit is (1) immediate (not waiting to deposit only after the allowable OA embargoes of publishers have elapsed) and (2) institutional (not institution-external).

Institutions can then (a) monitor and ensure compliance with the US Public Access Policy and (b) implement the institutional repository's facilitated Request-Copy Button which allows the author to provide an individual copy to an individual requestor with a single click on a case by case basis during the publisher's OA embargo period.

(Both metadata and full-texts of institutional deposits can then be automatically exported to or harvested byany central repositories desired: disciplinary, national, or even funder-based.)

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