I've just put together a rather decent Maven Archetype for Tapestry 5. It's called "tapestry-simple" and its documented here.
The archetype allows you to create a Tapestry 5 application in, literally, seconds. It generates the pom.xml (for Maven), .classpath/.project (for Eclipse), as well as web.xml, log4j.properties, the complete directory structure, even a sample Start.html and Start.java.
It also configures the Jetty plugin so that you can immediately run the application using "mvn jetty:run".
This took only a little doing. The Maven documentation was awful as usual (yes, kettle, stove, etc.), but peeking at a couple of the sample archetypes, and trying some experiments, allowed me to put together something relatively complete and polished in a couple of hours. And those hours will save thousands of developers an hour or two each.
To make this work, you need to edit your settings.xml to add in the Apache snapshot repository at http://people.apache.org/repo/m2-snapshot-repository/ ... but perhaps better (and almost as easy) is to check out the latest Tapestry 5 source from SVN and build locally. You'll want the tapestry-project, tapestry-ioc, tapestry-core and tapestry-simple projects. Do a "mvn clean install" and all the latest and greatest will be in your local Maven repository!