Sewell Direct, my employer, recently added a product that can potentially increase bandwith for your broadband connection by a factor of two. Of course, in order to increase the bandwidth you will need another broadband connection.
In the past, the only way to increase your bandwidth was to upgrade your connection, say from DSL to a T1. But with the introduction of the broadband aggregator, you can now combine two broadband connections, say two DSL lines, to increase bandwidth. By increasing bandwidth via the broadband aggregator, you can now add more computers to your network without worrying about slowing down internet speed since the aggregator automatically balances bandwidth amoung the computers connected to the internet. The aggregator is also a great tool for backup, in case one of your connections were to go down.