Multiple Service/Variable/Controller plugin files I'm not sure if I missed documentation on it, but is there a method to follow when including additional plugin files for services, controllers, variables etc.? 

For bigger plugins it'd help to do this, something like

- /myplugin
   -/services
      -MyPluginService.php
      -MyPlugin_OtherService.php
      -MyPlugin_AnotherService.php


I've tried doing this and being sure to follow the service structure of:

namespace Craft;

class MyPlugin_OtherService extends BaseApplicationComponent
{

  public function testing()
  {
      return "success!";
  }

}


But when trying to access it from say the myPluginVariable.php file, I get the CException error that the property is not defined.

return craft()-&gt;myPlugin_OtherService-&gt;testing();


Is there a step I'm missing? Do I need to declare these extra files somewhere so that they are included?
When calling services, you should not include "service" in method name.

Try return craft()-&gt;myPlugin_other-&gt;testing();