Sonnet offers FireWire 800 ExpressCard adapter

Sonnet TEchnologies released a FireWird 800 ExpressCard/34 adapter for $99.95.  

The interface provides two FireWire 800 ports. Although latter-day MacBook Pros already have a FireWire 800 port, earlier models do not, and some MacBook Pro users may find it handy to have two additional FireWire 800 interface as well.

Read more here (MacWorld)