Speaking of Italy: Make sure to check out the gelateria at Brupbacher Platz (Gelateria di Berna). They have a great variety, really tasty and very fair prices!

well I am Italian and the two I like best are
Bianchi by Bindella (delicious, authentic Italian seafood, $$$$ but worth it)
Restaurant Positano, Stampfenbachstrasse 6 (all staff are Italian, from the chefs to the manager).

La Baracca:

I had a fun night at La Baracca recently. The atmosphere and the food were great. I highly recommend the Pasta with Truffels...
www.ristorante-labaracca.ch

Best gelato north of the Alps:

Hi IrishPat,
at Richti Areal (between Wallisellen Bahnhof and Glattzentrum, opposite the main entry with the post office of Glattzentrum) you can find 'Schokolato'. It's not an italian restaurant but a bar. So, for dinner the wrong choice.
However, to have the best Italian Gelato (ice-cream) north of the Alps, you are at the right place. They also have great coffee, hot chocolate, tea, cakes/pastry.
If you're in the area, a lovely surprise and a great place to chill in the afternoon. (check Facebook for their opening hours. usually closed after 7 or 8pm).
Daniel

Italia:

I'm a big fan of Italia at Zeughausstrasse ristorante-italia.ch
Great food, beautiful venue, professional staff. My only problem - the menu is often in Italian only, which I don't understand :) that's where the professional staff comes handy...