Cordova 3.3.0 installed from fresh and PATH fixed with visibility to tools etc.
Build a new bare application Add android platform
now it starts to go awry -<
I followed this guide to create a Cordova 3.3.0 project, import it into Eclipse, and successfully run it on a device from Eclispe: http://cordova.apache.org/docs/en/3.3.0/guide_platforms_android_index.md.html#Android%20Platform%20Guide
You are right that it imports "HelloWorld" and "HelloWorld-CordovaLibs". This is because of https://issues.apache.org/jira/browse/CB-5232, which makes Android now use the CordovaLib instead of the .jar for a variety of reasons (see the bug report.) You should import both projects into Eclipse (I'll change this in the documentation).
If you follow that guide you should be fine. You don't have to build a .jar anymore.