Political Research Online (PROL)
The Political Science Association in cooperation with other professional groups maintains this archive of conference papers delivered by political scientists. Fill out a short form in order to gain access to PROL. Searching by words in conference abstracts is a good strategy.
Many of the conference papers are available as PDFs. If you want one that is not available full text, check for the author's email address on the Web and write asking for a copy.
This is a good place to look for treatment of recent developments that have not yet had time to appear in scholarly journals.
Conference papers from the International Studies Association are a part of PROL. But you can sometimes get better results by searching them separately at the ISA Paper Archive