There's two definitions of web services. The one Mart was referring to is a publish/subscribe service that usually runs over port 80/443 but can actually publish from or subscribe to any port you want. RSS news feeds are a simpler, older form of this. Google and Amazon have newer XML-based web services.
The type of web services pmormr is referring to are the traditional net services. By convention, the bottom 1024 ports are reserved for the net and some services have been traditionally assigned to specific ports as pmormr noted. You can set up your web server to use different ports, but your client programs have to know this and many are not configurable.
Changing stardard ports for specific funtions to something non-standard is a common security technique - e.g. some db's use specific ports for remote maintenance. It's a good practice to set it up for a different port than what comes out of the box. Many sites also configure a different port for telnet, restricted shell, etc.
Edited by dpyers
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