Of course, you’ll also need to obtain a copy of JRun 4, most likely from Macromedia’s website. We don’t have any agreements to redistribute any of the application servers so you need to obtain the ones you’re interested in using separately from MyEclipse.
And, you’ll also need a full release of Eclipse 2.1.x upon which to install MyEclipse. That download is available at eclipse.org. There is a link for convenience on our downloads page also.