Yes, I'm using Glade 3 which is available under many distros as "glade-3" (as opposed to "glade" which is Glade 2).
But more importantly, most people switched to using Glade along with libglade even back in the Glade 2 days.
Rather than using the "Build" feature of glade to generate code to build your GUI, you simply use the project file (with the .glade extension) to dynamically generate the UI at runtime. The .glade file is actually an XML file which is why you see us posting XML in some of the examples around here.
Libglade is a library which loads the UI for you, and as of GTK+ 2.12, GtkBuilder is available which does the same thing in (almost) the same way.
Here is a very simple example: http://www.gtkforums.com/about187.html
Simply paste that XML stuff into a text document and save it as 'hello.glade' and then you can open it with Glade 2 to see what it looks like. The source to use that glade file is also included.