zdi,
1) Could you please clarify which FAQ you are referring to? If you can give us a link, that would be great.
2) MyEclipse Blue does not include a WebSphere installation, though we do point you to the free versions that are publicly available; these are provided directly by IBM. Could you clarify what version of WAS 7 you have installed, exactly?
3) Are you porting a project from RAD or creating one from scratch in MyEclipse?
4) The com.ibm.websphere.cache.DistributedMap interface appears to be present in the WebSphere Home\plugins\com.ibm.ws.runtime.jar file – is this the interface you are referring to?