Until any IDE plugin can do the job of allowing us to arrange screen components visually, you can do it with DroidDraw, a tool available online, for Windows, Linux and Mac at www.droiddraw.org
For folks who are beginners in programming or just for doing some simple stuff, any taste of Basic usually was (is) a good development tool. Now Android goes Basic too. Check out simple at code.google.com. It comes in the 3 flavors Windows, Linux and Mac.