I've started to add some design patterns/common problems to a wiki page at codehaus. Please start adding more :)
http://docs.codehaus.org/display/LOGICABYSS/Design+Patterns

Current titles are:

• Min or Max Values
• Policy Encapsulation
• Policy Chain Management
• Validating Derived Objects Before Insertion
• Goals
• Simulate the Passage of Time
• Delayed Modifications

Mark