 How would you handle this design dilemma?
qhoxie: I agree that navigation is generally paramount, but some considerations:I don't think that silently discarding the data is the best option.  Depeding on the flow of the site, it is possible that notifying them that data will be lost is an option, but also a hinderance to their navigation.  Based on that, something to explore would be saving the data to be repopulated when/if they return to the form.  Obviously that can be a lot more complex than it sounds, so it would take some planning to make it fluid.