Navigating Quickly in Vs 2008 Service Pack 1

In the past, to navigate around bunch of files opened in vs 2008, I tend to use Cntrl + Tab to reach a particular file. It certainly is a good option but when you have large number of files opened in the project, you end up spending enormous amount of time just tabbing through the list of files until you get to the one that you want to open. Recently I discovered that when you use Cntrl + Alt + down array key, a small navigation window pops up at the top. The windows allows you to navigate to all the files opened. The best part about this window that I really like is, you can actually start type in the name of the opened file that you want to reach to and visual studio will automatically highlight the file that matches the name you are typing. Below is a screen that demos the feature.

I am not confirmed but I think this keyboard shortcut is new add on with service pack 1.