The last time I was there (Oct 06) the value resorts have a jack near the phone and once you "order the service" for I think it was $10, you have it for 24 hours and then you have to order it again. During the Oct. trip I didn't get it b/c we were only there for 4 days so it wasn't worth it to me, but when we took our long family trip (12 days) I got the internet service twice...it wasn't what I was used to at home, but it served its purpose.
As far as I know none of the Disney hotels offer WiFi service. Unless the Swan/Dolphin do. Everyone I have seen and read about have the ethernet connections in the room for a fee.