If you find that it’s a bit of a pain phoning WDW-DINE to make your ADR’s then there’s some good news for you. Walt Disney World now have a site that lets you search online and book your favourite restaurants online.
Simply visit http://disneyworld.disney.go.com/restaurants/ and search for your favorite restaurant.
If you are in the UK you have to do a little bit of a fudge. First visit http://disneyworld.disney.go.com/?forceDomestic=true followed by http://disneyworld.disney.go.com/restaurants/
It appears that special event dining such as the Fantasmic Dinner Show can’t be booked online yet, and you can only book a couple of months in advance. That said, you can pretty much search for any of the Restaurants in WDW such as the T-Rex Cafe and complete the bookings online.