+Polly Twitter Client
I know this is a pet projet for you, that's why I spent sometimes creating a wireframe and commenting it (see: http://is.gd/wwSJgw
). But at least 'Column' is a ill-choosen label as menu should use either verb or adjective ('Menu' 1st guidelines ).
First, for the menubar I would recommend to follow the 'standard menu' guidelines  with some adatptation to your application (i.e. Account | Edit | View | Insert | Help). Then, change the layout as it waste so much real estate which can be used to display content and information. On that purpose I did a wireframe based on version 0.93 layout and your new features.
Have a look at GNOME's Human Interface Guidelines, especially the one about menu (see links below).
'Menu' guidelines: http://is.gd/ltwW0f
'Standard menu' guidelines: http://is.gd/iu0rev
Thanks for your hard work :)