I came across a really useful link to a jpg/pdf that show most of the GOF's design patterns.

For those of you that do'nt know, design patterns are really useful abstractions that help you write better code.

When I am designing software I always try to think about how I can express my design in a design pattern as it makes it easier for people to understand

http://www.mcdonaldland.info/2007/11/28/40/ 

The thing I like about this is that its PDF so I can make a dead tree edition for my wall! 

Symbian have also got a link for common design patterns including a section you request what design patterns you would like to see

http://developer.symbian.com/wiki/display/academy/Common+Design+Patterns+for+Symbian+OS

 Finally Gabor blogged about it a while back, but the wiki has agood article on it as well.