My SWMBO loves Asti so I was looking it up a while ago. I was thinking of making a moscato grape kit and then sweetening it up after fermentation.
From Wiki:
Asti or Asti Spumante is a DOCG white sparkling wine produced in an area to the south of the town of Asti in Piedmont, Italy. Made from the Moscato Bianco grape, it is sweet and low in alcohol, and often drunk with dessert. It retains its sweetness through a complex filtration process. Another wine called Moscato d'Asti is made in the same region from the same grape, but produced by another technique which differentiates it from Asti.
http://en.wikipedia.org/wiki/Asti_(wine)
Found a moscato kit here
Wine Kits Plus .com - Winemaking supplies, kits and equipment.: Mosto Italiano
I just havent got around to doing it yet. (Fermentors are all full atm)