Eric, if you login as a system admin and double-click on any particular domain, under the Features tab you will find several features that you can enable/disable, for example, calendar, contacts, file storage, etc. However, RSS feeds is not one of those items nor is the option to remove the reports entirely. Please comment if that is something you would like added to our feature request list.
As for changing the name in the top left corner, that value is found in the en.xml file of the translations folder or as Steve Reid posted above. However, you may not remove all references to SmarterMail or the copyright notice as found in the About Smartermail.