What I'm looking for is similar to what forums have were you can take a mybb board or ipb and import/convert it into vbulletin and the other way around except I need it for Interspire/Magento. I don't want to lose all my hard work of adding products etc.
These folks offer that as a service http://app.shopping-cart-migration.com/estimator Its fairly complicated. I don't recall seeing a mod for this so its likely much easier to just let someone do it. I think they were fairly cheap. It depends on the number of products. Hope that helps, Nigel