- Alt+Shift+S - successively selects outer syntactic element. Statement -> Surrounding Block Statements -> Surrounding Block Statements -> Surrounding Method -> Surrounding Class and so on. I use this for quick selection for indentation using Ctrl+T or commenting using Ctrl+Shift+T.
- Alt+Shift+A - successively selects inner syntactic element. This works only if you had expanded the selection using the Alt+Shift+S. This helps me fine tune the selection if I went too far.
Source: sandip chitale's blog