Question: What version of Eclipse do I need for Google Web Toolkit? I see about 7 versions, but none make any references to GWT. Google doesn't mention it to. I did install the PHP version.

Answer: 
Definitely the Java EE version. The regular java version doesn't seem to work with the google plugin.
Well I download the Eclipse for Java EE:

<http://www.eclipse.org/downloads/packages/eclipse-ide-java-ee-developers/heliossr2>

But one which is great is Spring STS (based on eclipse). You can choose to install GWT at the beginning.

<http://www.springsource.com/downloads/sts>