Ok,
I am now in the middle of the Chianti,Toskana in a very remote place somewhere in the woods.
I have 5 bars of 3G.

During the ride down from Brenner to Florence i had coverage most of the time.
Here in the hills its obvious that it can't be 100% everywhere, but i'm pretty impressed,
keep in mind, italians are mobilecrazy and you see lots of iphones.!
Short summary.
I purchased a 3G Usim for iPad with tre.it or TRE in a store in Bozen april 2nd, (tip from a guy in an appleshop in Bozen) was activated next day.
They want your passport, no creditcard,you can pay cash so they don't get a hold to your bank.
Used it for one week in Veneto, was covered nearly everywhere.you can check coverage on their site tre.it its called copertura,there you can also check the stores available.
Its a rechargebale microsim (Usim)
They offer the following:
Its called Superweb for iPad.
3GB per 30 days for 5euro ,
I had to pay 20 euros ,thats the minimum.
The first 30 days are free, so i got 5 Month for 20 euro, that is the deal, you can't get just 30days for 5euro.
If you win the lottery and choose to stay here longer you can buy recharge cards in every bigger supermarket.(5,10,20euros)
It automatically renews as long as there is money in the account, which happend 2 days ago first time for me,so it works.
After 3GB they slow you down to gprs(haven't had the experience so far), i also haven't found out if there is a day limit of 100 MB or so, i do don't see any so far.
I also found out that you shouldn!t try their webpage (tre.it) first, instead you go to the mobile version,
which is htpp://portale3.tre.it/Superinternet it recognises your card and info.( i just found out because they send messages to the ipad screen,( should be always a good idea to keep them via screenshot)
There it is possible to view your details, usage so far and send them messages.(only here in italy)
Also there you enter your email adress so they might communicate with you, because the goal is to get a password without using sms,which i obviously don't have on the ipad.
Its all in italian, but you can cut and paste with the iTranslate app.
I send them the following this morning

best i could put together,natives please chime in)
Ciao,
Ho un 3 MicroSim comprato per mio iPad. Il numero è (my number)
E il pin è (pin)
Ho bisogno di una password per l'area Cliente. Non riesco a ricevere SMS.
Molte grazie per il vostro aiuto
My name and emailadress
Now i wait for reply, but i think i am fine for now.
I am here:
(see picture, expl. the upper left corner)