I have been doing a little bit of research into the GWT (Google Web Toolkit) and it is one powerful bit of tech.

I had previously written it off as a technology that provided a rather limited set of widgets, and couldn't see the value in it. After doing some research, I'm thoroughly impressed.

I have begun to migrate to Java as my language of choice and am dabbling in the world of online applications.

Why is this great? Simple. It allows you to use Java's rich libraries and the structure of OO programming to produce a client-side Javascript app. It's so powerful, in fact, that it has been used to port Quake 2 to HTML5!
http://code.google.com/p/quake2-gwt-port/
VIDEO: http://www.youtube.com/watch?v=fyfu4OwjUEI

But because you're coding in Java, there's a tremendous opportunity to create an app that truly spans platforms. For example, it's possible to create an Android/Linux/Windows/Mac/Web app with a single JAR. Not bad at all, and a fine testament to the portability of Java.

I'm also very confident that there will be a NaCl port of a java interpreter, as it can be as small as 50K, a tiny bit of overhead for a web app, especially if you cache it in the client. What's left is a small JAR and a complete app. Write once, run anywhere. Amazing.