In the introduction to his comprehensive and endlessly useful book "Brunello to Zibibbo: The wines of Tuscany, Central, and Southern Italy, Nicolas Belfrage maintains that correct pronunciation "is an important tool for understanding Italian wines" since "once you get the sound, the flavors too fall into sharper focus."
Though I can't go very far in explaining why this should be so, I strongly endorse the theory - primarily because I find it true in my own experience. Not knowing how to pronounce a foreign place name or obscure grape variety makes the thing all that much more alien and remote. Learn to say it like a native, and you are immediately on intimate terms with it.
The thoughtful and lively Jeremy Parzen, who blogs at dobianchi.com must understand this too, since he has recently undertaken to provide a video glossary of Italian wine terms, spoken not just by by natives - but by natives who are also in the wine business.
The Italian Grape Name and Appellation Pronunciation Project is enormously entertaining to scroll through - and there were some surprises in store for me. Among the wines whose flavors will now fall into sharper focus because I've had a lesson in elocution is aglianico del vultura, as articulated by the sweet-faced Sara Carbone, below.