Hi,
The SampleViewer is a completely customizable and a plug and play kind of system. You can enhance the viewer by added more widgets. Widgets are flex modules. There are two kinds of config xml in sample viewer.
1) That has configuration for the entire Sample Viewer.
2) Configuration for each widget (These config are present in the widget folder)
The feeds you see are widgets that are in the root folder of the sample viewer (filename: config.xml). All you have to do is remove the xml definitions under <widgets> from the config.xml and you will see that they are not in the top menu anymore. Since the menu is build at runtime, you don't have to compile the flex app to see the changes.
As for the ESRI logo, if you add atleast one layer (either to the livemaps or basemaps in config.xml) that points to your Enterprise ArcGIS Server and set the map.logoVisible = false; the logo will be hidden. They are also many other ways to hide them. You can search for it in the old forum.
Thanks
Prashanth Sukumaran.