Metaobject Protocol - Information page on the original Wiki, at (Ward) Cunningham & Cunningham, Inc. - http://www.c2.com/cgi/wiki?MetaObjectProtocol
Gregor Kiczales's Page - Coauthor of book: The Art of the Metaobject Protocol. Leading researcher of Aspect-Oriented Programming. Professor, computer science department, University of British Columbia. - http://www.cs.ubc.ca/~gregor/
Metaobject - Growing article, with links to many related topics. Wikipedia. - http://en.wikipedia.org/wiki/Metaobject
OpenJava - Extensible language based on Java. A Metaobject Protocol (MOP) is the extension interface; lets programmers customize language to implement new language features, mechanisms. - http://www.csg.is.titech.ac.jp/openjava/