The App Engine SDK carries a bunch of sample applications that help you get started quickly. The Google Plugin for Eclipse provides an easy way to import these applications in your eclipse workspace. You can now just click on Import App Engine Sample Apps... under the Google icon. This will let you choose the sample applications from the App Engine SDK.
Note: App Engine 1.7.0 carries only one sample application that can be imported into the Google Plugin for Eclipse. The remaining sample applications will be available for import in the Google Plugin for Eclipse in App Engine 1.7.1, which will be released shortly.