I recently moved into a new house, that has telephone ADSL, every now and again it goes down. I wonder if there is some software (free) you can get that plays some alarm when the internet goes down. This way I can know when its down if I am in another room.
You could have a program ping regularly a well-known website that is known to be always available (google.com for instance) and alert you if it is not reachable.
I think many other programs can do this.