Originally Posted by bdrd
and please forgive my ignorance here...
Haven't seen any
Generally speaking most of those devices will work under linux, but may, depending on the linux distribution your husband's using, require some manual configuration.
Most of those devices are connected via USB, so in most cases you will be able to just 'plug and play' them and an appropriate "driver" will automatically be loaded.
Maybe you should show us the specific devices you're thinking about, so that maybe someone here can just tell you "Yeah, it works."