This new Vista theme for avast! is amazing, beautiful and a much needed addition. 
What separates this theme from all others is that it is clean, professional and can be used in a corporate environment. I’ve been complaining for a long time that the default theme for avast! is just too childish in appearance and clunky looking. But maybe that’s just my opinion. ;D
Also let me add that it would truly be a tragedy if this theme is not the default theme for Windows Vista.