Most of the time I see dropdowns used for US states because most of the time a user only needs to provide one state for an address.
I'm working on a value exchange form/tool that asks you how many business locations you have and you need to input all the states because there are various state regulations that affect what kind of services we can offer you.
Anyone ever seen anything good? I'm thinking of maybe just using a map with mouse over states that say the name. onClick: selects/unselects. But I know that's going to take me forever to build in axure.
I guess I'm looking for a mechanism for selecting a lot of items at once.