Gnome Bankers

In my current (non-Cavernia) campaign, gnomes created an international banking system. Balances were magically kept up to date so that PC's could drop money off at their nearest bank and have it available at any other branch anywhere in the world, for a small fee of course. This allowed PC's to avoid carrying around immense amounts of loot especially now that they have started an international air shipping company (not officially yet).