I'm quite excited that Google has added Java as a supported language in Google App Engine. Google App Engine is a free (up to a certain quota) service from Google where Google hosts your web app and handles all the issues involved in making it scalable and so on. Check out the Google App Engine site for more info. Google App Engine has been out for awhile but until a couple of days ago it only supported Python as a development language. Python is fine, so far as it goes, but outside of Google itself Python has nowhere near the base of web application support that Java does. I expect Java support to really blow the lid off of Google App Engine. In supporting Java, Google also supports a number of java based frameworks and JVM based languages. Most notable for me is support for writing a Google app engine app in Groovy.