When I first downloaded CRM 2011 I remember thinking it would be a lot of fun to take a crack at the new 2011 CRM web schemato see what all was in there and what the new schema looked like. Much to my dissapointment there was very little in there. Where were the entities? Where were the new messages? This frustration has repeated itself several times now in the forums as well.
It turns out that there is a quick 2 step process you can do to get exactly what you are looking for.
Here is how it works:
1. First, download the WSDL for the Organization Service from Settings - Customizations - Developer Resources
Now, once you have saved the WSDL to a location open it in any XML editor or viewer.
Examine the wsdl to find the <wsdl:import> tag and the url you want browse to obtain the entire WSDL will be in the "location=" attribute of the tag.
It appears to take this form:
Here is an example of finding it in my WSDL:
Now just browse to the location highlighted above and you will have the complete WSDL for the Organization Service.
I hope this helps!