The Bishop Museum is compiling an online database of information on Hawaiian archaeological sites excavated by this institution. At this point, Hawaiian Archaeological Sites (HAS) consists largely of tables of information sorted by island and district but there is also bibliographic information and occasional links to a manuscript data base.
Note: This is a brand new site. Be patient! There are already plans for phase 2 which will include artifact images as well as 500+ PDFs of archaeological research manuscripts. Keep an eye on this site; it is going to be an amazing resource.
Special thanks for Research Buzz for bringing this to my attention.