Seeing the gopher address for the Robert Wood Johnson Foundation prompted me
to look at the Foundation Center.  They have several information pages
including one on grantmakers.  Take a look at "http://fdncenter.org/" (forget
the quotes).  They have linkes to several foundations - try George Lucas Fdn
and are trying to provide even more.

If you make it to the SRA meeting in Chicago, there will be several sessions
devoted to web topics.