The Masmovil 3G dongle that Phil supplies works great. Very fast and cheap enough - costs me about 17 euros per visit with a facebooking mad wife on it all the time.
If we can get a fixed line internet service in the future I would take that up because with a Wi Fi set-up you can access all sorts of things (Sky TV) that you wouldn't do on the dongle even though you could, but it would cost a fortune.
Jon Faulkner