I just posted some notes on what I've been able to glean about the
Zotero REST API based on studying Jeremy Boggs' phpZotero library
(http://github.com/clioweb/phpZotero/blob/master/phpZotero.php)
http://blog.mashupguide.net/2010/01/28/zotero-rest-api-early-developments/
(BTW, since I no longer work for the Zotero project, what I write here
is in no way official documentation -- but rather the work of an
enthusiast who'd really like to see the Zotero API move forward.)
Comments are very welcome!
-Raymond