A service that I love in Sydney is Menulog who will collect and deliver restaurant food from restaurants in their network that do not have delivery drivers. At only $3 on top of your order this is cheaper than many restaurants used to charge for delivery using their own staff.
Perfect for when you're craving food that's not standard delivery food, are too sick to leave the house for soup or for those times when you want to order online with a credit card and avoid talking to humans (high praise from many nerds). On top of the price and convenience Menulog will also SMS you when the restaurant receives the order and when their staff collect the food for piece of mind.
Menulog now have applications for smart phones making it super easy to order Chinese from the couch! The app is available for both iPhone and Android and is free, if you don't own a smartphone there's a mobile browser link that works as well.