Looks like deleting a box selection has been around for a little while in both Visual Studio and Office (simply hold the alt key while you select the text), I just never knew about it. Heck, only recently learned about using the clipboard ring a few months ago. VS 2010 adds the ability to also do inserts and replaces when doing a box selection, which really would come in handy while coding.
"Creative Coding with Unity"
10 hours ago