I'm also interest to implement JavaScript-only PDF viewer component and Google maps component, because both component are base on the JavaScript.(and ajax)
Google maps component, The GMap componet provides an interface to the Google Maps API within T5. It will provide users a clickable map for entering latitude and longitude, as well as it adding content to the map through a variety of services, allowing you to create robust maps applications on your T5 website application. Using java script and ajax i can easily implement this component. JavaScript-only PDF viewer component , This component provide to Tapestry user view PDF document through the web browser.This component.look like Acrobat online eBook reader.This a client side PDF viewing module therefor project was base on javascript. http://wiki.apache.org/tapestry/Tapestry5AndJavaScriptExplained charith