So, are you talking about restoring/refurbishing the mechanical/electrical subsystems on your New Beetle? Or, are you looking to tart-it-up cosmetically? The forum has answers for just about anything New Beetle-related. For example, there's an entire sub-section of the forum dedicated just to maintaining and tweaking the 1.8L turbo-engine.
Just let us know what you've got in mind and we'll try to provide the necessary guidance.