I don't hear much about GWT any more.
When it first came out, it seemed to be all the rave in certain RIA circles.
But lately my impression is that GWT has suffered a dip in popularity because solutions like Jquery/MooTools/Prototype offer a much easier way of solving the same problem.
Is this accurate or does GWT solve a different type of problem?
GWT and javascript libraries serve two different purposes. GWT generates web applications from java code and javascript libraries can be used as a component within web applications. Because javascript libraries can be used in many different types of web application projects (ASP.NET, Ruby on Rails etc.) they may have more of an audience than GWT but the functionality of GWT isn't something javascript libraries completely replace on their own. Depending on needs, both can be very useful for their respective audiences.