I have one at home, hacked it and now use it as a 'wireless bridge'... If you do it right it lets you connect USB non-wireless devices to your wireless network.
More info...
And it doesn't have to be 2 BT hubs, I have a 6 year old non-branded cable router connected to the hub to supply the internet to it.
This is a good site to get all the firmware updates you need to hack it...
homehub hacks