I would suggest buying the book "Hoi - Your Swiss German Survival Guide". It's more specific to Zurich dialect too, which will be helpful for you. I guess I'm not sure if I agree with the other posts (yet!)... still a friendly 'undecided'. There are ups and downs to learning Swiss and not High German. I pretty much only speak Swiss German here in the Engadin and wasn't really accepted by the locals till I did, but Zurich is a great place if you're English. At first I thought I would get by with High German but can't express how difficult it was for me to communicate and be understood. Mind you, I don't live in Zurich... I do think it's important to learn their language tho, if you are intending to be here and take on the Swiss lifestyle...