Jesus Perez in Refactoring writes that if we have a subclass that adds very little to a super class then we should eliminate the subclass and extend the super class. In this way we will avoid classes in which there is only a little code. See an index of the full list of refactorings.
Cesar Tardaguila in design-nation posts a link to "Prevalence: Transparent, Fault-Tolerant Object Persistence" by Jim Paterson. Prevalence is a Java framework for achieving object persistence without using a database. It works by taking a screen shot of the object in memory and serializing it to disk.
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