Brittany Behrens from the Visual Studio Editor Team has an excellent 3 minute video that shows off a few cool VS 2010 multi-line code editing scenarios with box selection (note: enable your speakers as there is audio during the demo):

Watch it to learn a few ways you can use this new box selection capability to optimize your typing in VS 2010 even further:

Hope this helps,

Scott

P.S. You can learn more about the VS Editor by following the Visual Studio Team Blog or by following @VSEditor on Twitter.