Reusing types in WCF

For those of you who ever wrote a web service (I guess most of you have), sharing types was an impossible mission. If you had defined a type in the server side (the web service side), when consuming it on the client side, the proxy generated for you contained the same type but under a different namespace. Do you know that problem?! When WCF shipped, a new possibilities emerged. One can now share types and reuse them.