The May 2010 Release (build 18.104.22.1689) is live: http://mfcmapi.codeplex.com.
Mostly bug fixes and the ever expanding scope of Smart View. I’ve added parsing for PT_LONG as a date, enabling parsing of a number of props I couldn’t parse before. I also added parsers for Web View Persist Objects (PR_FOLDER_WEBVIEWINFO) and Recipient Row Streams (dispidApptUnsendableRecips).
Here's a change list - see the Issue Tracker on Codeplex for more details, or look at the code: