Something to read

http://www.eclipsezone.com/eps/10minute-rcp/
http://wiki.eclipse.org/index.php/Rich_Client_Platform
http://www.onjava.com/pub/a/onjava/2006/08/23/eclipse-rich-client-platform.html
http://www.vogella.de/articles/RichClientPlatform/article.html
http://ianskerrett.blogspot.com/2005/12/when-to-use-eclipse-rcp.html