Although this isn't really a module, I wanted to let everyone know that you can use the database integration features of FedEx ship manager for insanely easy shipping with zencart.

You need an account with fedex, but its possible to configure the integration settings so that all you have to do is type in an order number, and you're printer will spit out a label. We use it to automatically create labels for multiple boxes within a single order as well.

If anyone has any questions, I'd be happy to help but please post here so others can see solutions.

Thanks!