Frances said: "I think each person was allowed 4 bottles??? does anyone know the limit??"
I don't know of any limit, but over certain levels you may have to pay some extra. For carry-on, it depends on the weight limit of the airline. For most, if you're over 50 pounds in a checked bag, you'll have to pay extra. If you have a very light-weight bag, you can bring home a dozen bottles of wine and still be just under 50 lbs.
Regarding customs, from what I hear, the customs charge is a whole lot less than the cost to ship the wine home (glass bottles of liquid are heavy). Often, they say, the customs charge is just a few dollars and the agent will just wave you through because the amount due isn't worth the paper work to collect it.
Also, check with your airline just to be sure...most allow alcohol, but at least one Italian carrier forbids checking bags containing alcohol...as if anybody could get wine to burn!
Everybody I now who has studied the subject says checking the wine as luggage is the way to go. Shipping home from Europe is prohibitively expensive.