http://www.eclipsepluginsite.com/index.html
http://lizhensan.iteye.com/
http://help.eclipse.org/indigo/index.jsp?topic=%2Forg.eclipse.platform.doc.isv%2Freference%2Fapi%2Forg%2Feclipse%2Fcore%2Fruntime%2Fpreferences%2FInstanceScope.html
http://book.51cto.com/art/201005/201417.htm