Is there such a thing as a bridge between ADAT and USB? It seems simple enough, and seems like it should be a very cheap device -- just do some translation from the ADAT digital stream into USB. But google is failing me.
I couldn't find anything for USB, but there seem to be several Firewire audio interfaces that also have ADAT optical inputs.
This thread on gearslutz seems to suggest a couple different Firewire interfaces.
If you have a Mac or MacBook you probably already have a Firewire interface. If you have a PC you can get one cheap. If you have a PC laptop, you may be out of luck.