As you may or may not know, one of cool new features in Jackson 1.6 was the way to solve problem of parent-child links: cases where you have "back links" from one object to another. These are particularly common in ORM situations.
While feature itself has documentation here
, there's a good article, "Jackson to rescue
", which I think you might find useful.
In general, it would be great to post links to useful articles here; I will also try to update FasterXML Jackson Wiki with links where appropriate.