Top OOAD & UML Resources Tutorials etc.

1. Object Oriented Analysis and Design Using UML : A good white paper giving  Use Case, Object Modelling, and Sequence Diagramming notations of UML, how Object Modelling maps to OO programming languages, and shows how these notations hang together to complement each other.
2. UML.org Official website. :
   • The current UML specification, Version 2.1.1, for free download
   • Standard UML Profiles and related specifications
   • Articles about UML
   • UML Resource Pages
   • UML Tutorials
   • OMG's UML Professional Certification Program
   • Lists of UML Tools
   • Materials about Modeling Methodologies
3. Object-Oriented Glossary
   http://www.microgold.com/Stage/Glossary.html
4. Allen Holub's UML Quick Reference
   http://www.holub.com/goodies/uml/
5. Learn Object Oriented Programming concepts