Every year people always ask various questions about the internet in halls, so maybe I should try and write a little bit about that.
Every room in halls has an ethernet port which connects you to ResNet(the residence network) and thus to the university network and thus the internet. You do not need to pay anything to use this network (it is included in your accommodation fees). You will need an RJ45 ethernet cable to connect (available from many places in town, including BESS, the students union shop). There is currently no wireless provision in hall rooms, although it is available in a few places in residences such as the DRA bar and the New Hall coffee shop.
You may register one computer at a time on the network, and may not use routers or switches of any kind. IT Services say that if they detect the use of such items, your access to ResNet may be suspended.
The download speed when using the internet is incredibly fast. I don't have any exact figures right now, but I could download a file of ~350MB in 2 minutes (obviously this depends on where you're downloading from :-)). Basically, I think you will always get (close to) the highest download speed possible.
edit Luser gave speedtest figures of 90Mb/s download, 0.35Mb/s upload on one occasion. Obviously speeds will vary
Torrents will not work on ResNet. There are, as always, rumours of ways of getting around this, but for the average user torrenting is not possible. Any other types of P2P sharing are also forbidden. MMORPGs are also not allowed, but there are definitely ways of playing them (I've witnessed a few people doing it. IT Services state that VoIP and video conference software will not work, but I personally have been able to use Skype for voice calls (never tried the video facility) and webcam over MSN.