Sites More Specific to DESIGN PATTERNS

very important one
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http://home.earthlink.net/%7Ehuston2/dp/patterns.html

http://home.earthlink.net/%7Ehuston2/dp/patterns.html
http://home.earthlink.net/%7Ehuston2/dp/strategy.html
http://home.earthlink.net/%7Ehuston2/ps/mastermind_article.html
http://home.earthlink.net/%7Ehuston2/dp/patterns_quiz.html
http://www.cmcrossroads.com/bradapp/docs/patterns-nutshell.html
http://www.hillside.net/patterns/onlinepatterncatalog.htm
http://hillside.net/patterns/EuroPLoP2002/papers.html
http://www.abstractspoon.com/

to do list.. implementation very good one
we can see the implementation and the executable..try to dig from architecture perspective.
http://www.codeproject.com/tools/ToDoList2.asp