If you are not using Boxes tab, no harm done, but if you were using it, you probably want to know how to get it back.
to put back your boxes tab:
1. go back to the page where you removed the Unnamed App from.
2. select "edit settings" for an app under the "added profile boxes" section
3. click remove, then click add when it appears.
http://answers.yahoo.com/question/index?qid=20100126190431AAJkPoW
More info:
http://www.thatsnonsense.com/index.php?location=view&id=647
http://www.facebook.com/help/?question=327204
http://wiki.developers.facebook.com/index.php/Tabbed_Profile
Lesson learned?
Don't believe everything on internet and Facebook.
