Yes, all WDW resorts now have both broadband ($9.95 per 24 hour period) and dialup available in each room. Dialup is $0.35 per call (for DVC members at DVC resorts) as long as it's a local number. Dataports are on every room phone. Cost for non-members (and members staying at non-DVC resorts) is $0.75 per call.
Broadband will need a network cable- and is supplied by the resort if you don't have one. There are also some WiFi access spots in some resorts, but none in the rooms. WiFi also has access charges.