DISCUSS: Very Large Home Networks (a.k.a. House O' Torrents)

"... In total it's 12 rooms with 14 laptops and 6 desktops... We would like to just provide each room with a WIRED LAN/Cat5 internet connection, and if they want Wi-Fi, they get their own router. Question is how should this be... [configured]?"

One of our readers from the Netherlands has moved into a communal living group with 20 computers sharing a single home network. This house full of BitTorrent fans need help in scaling up their network: Their 25 Mbps (!) Internet connection isn't quite cutting it apparently. Short of taking shifts at getting online or kicking their torrent habit, what would you do in this situation?
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