said by MooJohn:I wasn't aware that Cisco did much in the way of wireless networking hardware to start with. Sure I've seen their 80211 access points but I don't know about anything they make for wireless on this scale.
One of Clearwire's main investors is Motorola so it's not like they'll have trouble sourcing radio hardware.
Cisco bought Navini networks in 2007, which was a big player in outdoor wireless deployments for internet access purposes. The problem is outside of very few large ventures like Clearwire most wireless ISPs do not have the money to spend on a solution like theirs.