Split screen in Visual Studio can be used for various reasons, but it really excels when writing tests.  To split a screen, right click on the Tab in the editor, and select New Horizontal Tab Group.  You can tab vertical too.  To undo the split, right-click on the bottom (or right) tab and select Move to Previous Tab Group. 

The following figure shows a test in the top pane and the method being tested in the bottom pane:

I’ve been doing a lot of manual parsing on Twitter dates with LINQ to Twitter and it kind of bugged me how primitive the implementation was.  Messing around today, I put this together:

var twitterDate = DateTime.ParseExact("Thu Jan 24 22:14:29 -0700 2008", "ddd MMM dd HH:mm:ss %zzzz yyyy", null);

One statement; That’s more like it.