design patterns and you

[HT]

1. what design pattern have you ever used in your projects and what was your experience?
2. What are procedure you follow from conception of project to final release?
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[HT]

Uh!
So techie geeks, how do you make your program? Without any design?
So far pattern I have ever used/using are:
MVC
Observer Pattern
Singleton
AFAICR, these are the patterns!
What about you?