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In Java, I have used Prevayler in a previous project (about 2 years ago), and I really liked it:

http://sourceforge.net/projects/prevayler/

The reason I'm not using it right now is because Hibernate makes OO mapping so easy and trivial that I honestly don't see the need. But it still a good solution if using a DB is an overkill.

I believe there's a Prevayler port for Ruby.

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Even more interesting, happs (http://happs.org) combines a number of things: a prevayler-style in memory persistence layer, twisted-style event-driven programming, and SEDA-style non-blocking IO.

It's built in haskell, which really is a beautiful language if you can wrap your head around it. Much like lisp in that sense.

http://madeleine.rubyforge.org/ is a Ruby implementation of similar ideas, I believe.

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