Tomcat VS Jetty
I like how Jetty can be embedded in an application so that it doesn't need to run in a web container (Hudson and Nexus are two apps that can run in this mode). Can Tomcat do this?
I love Jetty for its low maintenance cost. It's just unpack and it's ready to roll. Tomcat is a bit high maintenance, requires more configuration and it's heavier. Besides, Jetty's continuations are very cool.
EDIT: In 2013, there are reports that Tomcat has gotten easier. See comments. I haven't verified that.
I think tomcat is more disscussed and supported by application, Jetty is portable and can be embedded in an application. and Jetty has good continuations.