Here is a sample Embedded Tomcat you can start in a Scala project:
Here is a sample Scala Servlet outputing html directly. This is a simple example, but it shows something important. With Scala, the view layer can just be regular scala classes. There is no need for JSP or other templating languages as Scala already embbeds XML very nicely. By using the reloadable feature of Tomcat (there are also other pure Scala ways) and Eclipse autocompile, changes are instantanously taken in account.
Now I am eagerly waiting for improvements in the Eclipse Scala plugin (Organise imports, class navigation).