There’s not much info out there on embedding a Jetty server in Spring, and much of what does exist is for Jetty 5 (not Jetty 6) or uses helper classes that nobody wants to write. However, there is a decent example hidden in the Jetty Subversion repository (which requires an exploded WAR directory structure), and the Jetty documentation is pretty nice. The API docs are useful, as well.
I had two goals: embed Jetty 6 (not 5), and do so without having to rearrange my directories into an exploded WAR structure. After a bit of tinkering, this is the file I ended up with. It contains 5 servlets and their mappings, just so that you can get a feel for the file, but you can certainly use it with any number of servlets.
Note that I had to change the file extension from .xml to .txt in order to appease my blogging software… Note also that this setup does not require the exploded WAR directory structure. The parts you’ll probably want to customize are the servlets list, the servletMappings list, the resourceBase property, and possibly the contextPath property.