These days I have been hearing a lot about MX2004's integration with Webservices, from my friends and finally decided to try it out. I started developing a SMS Application, using the free webservice available at WebserviceX and give it a web interface so people around the world can use it. I was amazed by the time it took me to do it, it just took me 10 minutes taking away the time I spend on developing the UI.
You can have a look at this app at http://www.lastashero.com/sms.html
At present there is one restriction in this application. It can send SMS only to mobile subscribers in India and in some cases only to post-paid subscribers (!?).
Many thanks to Jeffrey Hill for his excellent tutorial in flash-db.com on how to use webservices in MX2004. You can find the tuorial here : Using the Flash MX 2004 Web Service Classes