iPhone Deal Unprecedented?

By now we've all heard about Apple and Cisco agreeing to "share" the iPhone trademark. I'm not at all surprised that a deal was reached, even if it did take much longer than expected. What I'm wondering is this: has there ever been another case of a company (Cisco) agreeing to let another company (Apple) use its trademark to identify a product so similar to its own? I'm an unabashed Apple lover and Steve Jobs fan, but I'm shocked that he has this much clout or could pull this off. I mean, he basically got Chambers et al. to pseudo-abandon the trademark, which Cisco clearly owned. Anyone know of any similar cases where this sort of agreement has been reached?