It looks quite good to me! The only thing I could say is that the
white background in the result list has a strong contrast with the
dark colours of the theme. Have you tried to reduce that a bit?
Also, I am not sure about the terms of those fonts... they are already
available on Vista and Windows 7, but I don't think you can distribute
them freely. However, people using windows XP can obtain them directly
from Microsoft installing the PowerPoint Viewer 2007, avalaible here: