Beautifully format your .net source code in seconds!
Ok, so you're creating a beautiful .aspx page - and then you flip to design mode to use an auto tag or something. You flip back to the source and WHAMMO your beautiful layout has been messed up by the stinking asp.net design mode!
So, you spend the next 5 minutes wasting your life by ensuring all the div tags etc line up...
You hit Ctrl K then Ctrl D and in seconds your code is wonderfully, beautifully, elegantly laid out!
This works on code-behind files as well