This is a very simple plugin for Sublime Text 2 that prettify (format with tabs and new lines) selected text in your active window.
Place XmlPrettify.py under ~/Library/Application Support/Sublime Text 2/Packages/User/ if you’re a Mac and under %APPDATA%\Roaming\Sublime Text 2\Packages\ if you’re a PC. Linux guys figure everything out themselves.
You also need to add key binding. Insert { "keys": ["super+shift+x"], "command": "xml_prettify" } in Preferences / Key Bindings - User in the list between [ ]. In case you have not heard ‘super’ is the ‘command’ ⌘ key. If you have Windows, just write ‘ctrl’.