Selected groups working in:

Organic Electronics

Bernard Kippelen group at Georgia Tech (http://www.ece.gatech.edu/research/labs/krg/)
George Malliaras group at Cornell (http://people.ccmr.cornell.edu/~george/)
David Martin group at U Michigan (http://msewww.engin.umich.edu:81/people/milty/)
Daniel Frisbie group at U Minnesota (http://www1.cems.umn.edu/research/frisbie/)
Kenneth Singer group at Case Western (http://nlo-server.cwru.edu/)
Michael Gershenson group at Rutgers (http://www.physics.rutgers.edu/~gersh/)
Stephen Forrest group at Princeton (http://www.princeton.edu/~ocmweb/)
Center for Polymers and Organic Solids at UCSB (http://www.ipos.ucsb.edu/index.html)
Larry Dalton group at U of Washington (http://depts.washington.edu/eooptic/research/index.html)
Various groups at Interuniversity Microelectronics Center in Europe (http://www.imec.be/PME/Welcome.shtml)
Experimental Solid State Physics group at Imperial College (http://www.imperial.ac.uk/research/exss/)

Ultrafast spectroscopy of organic materials

Frank Hegmann group at U of Alberta (http://laser.phys.ualberta.ca/~hegmann/)
Valy Vardeny group at U of Utah (http://www.physics.utah.edu/~rpolson/)
Ted Goodson III group at U Michigan (http://www.umich.edu/~michchem/faculty/goodson/index.html)
Toni Heinz group at Columbia (http://heinz.phys.columbia.edu/index.htm)
Ahmed Zewail group at Cal Tech (http://www.lms.caltech.edu/index.html)

Single-molecule fluorescence spectroscopy

W.E. Moerner group at Stanford (http://www.stanford.edu/group/moerner/)
Paul Barbara group at U Texas at Austin (http://research.cm.utexas.edu/pbarbara/)
A site from Shimon Weiss at UCLA with links to a number of groups working in the field of single-molecule spectroscopy as well as to nanoscience-related sites (http://smb.chem.ucla.edu/links/links.htm)