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.
Also let me add that it would truly be a tragedy if this theme is not the default theme for Windows Vista.