Found via: JCB to HHMI: Why did you sell out to Elsevier?, Alex Palazzo, The Daily Transcript, July 18, 2007.
About an editorial, How the rich get richer, by Mike Rossner (Executive Director, The Rockefeller University Press) and Ira Mellman (Editor in Chief, The Journal of Cell Biology), J Cell Biol 2007(18 Jun); 177(6): 951. Epub Jun 11, 2007.
Excerpts:
HHMI [Howard Hughes Medical Institute] will bestow monetary rewards on a commercial publisher in return for the type of public access already provided by many nonprofit publishers.
…
Two problems with this deal immediately come to mind. First, there is a clear potential for conflict of interest when a publisher stands to benefit financially by publishing papers from a particular organization. Second, and even more seriously, this action by HHMI undermines the effort to persuade commercial publishers to make their content public after a short delay, by rewarding them for not doing so.
See also: Paying a fee for Green OA, 21 Mar 2007.
And: Elsevier, HHMI and Open Access, Kaitlin Thaney, Science Commons, 8 Mar 2007.

tillje said
For an update, see: HHMI responds to criticism of its Elsevier deal
Peter Suber, OA News blog, 25 July 2007.