misterdoggy wrote:I make the espresso, then heat the milk and pour. Now the milk is very foamy so it does not retain heat well.
I dunno -- my microfoamed milk
does retain heat quite nicely.
misterdoggy wrote:I keep heated glasses but while they wait for the milk to get done on the counter by the time it gets served they are at best lukewarm
Then they aren't very well-heated, are they?
Bruce, do you keep your cups on top of the machine? Your Vibiemme should get your cups to a nice, toasty temperature, and a thick porcelain cup should retain heat quite nicely.
A few options:
1) As Dan already suggested, you might want to take a look at
Bodum 9 ounce double-walled glasses size.

2)
Frabosk has double-walled inox/stainless steel cappuccino cups (as well as espresso and latte sizes, too).

(I know you are in France, and these links go to US retailers, but I am
sure these are available in France, too.)
3) Check out
Nuova Point and other Italian porcelain companies.
Cheers,
Jason