Must read
[http://www3.software.ibm.com/ibmdl/pub/software/rational/web/whitepapers/2003/intro_rdn.pdf Introduction to the Unified Modeling Language] (PDF) by Terry Quatrani;
[http://odl-skopje.etf.ukim.edu.mk/uml-help/ UML Tutorial in 7 days] by Slobodan Kalajdziski;
[http://bdn.borland.com/article/0,1410,31863,00.html Borland's UML Tutorial]
[attachment:Non-SoftwarePatterns.pdf Non-Software Examples of Software Design Patterns (PDF)] by Michael Duell.
Online Resources
[http://www.uml.org/ Official OMG UML site], but do not try to read the entire UML specification.
[http://bdn.borland.com/article/0,1410,31863,00.html Borland's UML Tutorial]
[http://odl-skopje.etf.ukim.edu.mk/uml-help/ UML Totorial in 7 days] by Slobodan Kalajdziski;
[http://www.holub.com/goodies/uml/ Allen Holub's UML Quick Reference]
[http://www.phruby.com/stencildownload.html UML 2.0 stencils for Visio 2003]
[http://www.objectcentral.com/oobook/oobook.htm Essense of Object Oriented Programming]
[http://www.csc.calpoly.edu/~dbutler/tutorials/winter96/crc_b/ Object-Oriented Analysis and Design using CRC Cards]
[http://www2.ing.puc.cl/~jnavon/IIC2142/patexamples.htm Non-Software Examples of Software Design Patterns (PDF)]