I have learnt most of the little turkish I know from the linguaphone PDQ course. I was taught that:

´Do you live in Istanbul´ is Istanbul da mı yaşiyorsunuz

but

´Do you like Bursa´ is Bursa´ya seviyormusunuz

Is there any particular reason why the positioning of ´mi´ differs in the two sentences? Is it as valid to say ´Istanbul da yaşiyormusunuz´ for the former or does ´mı´ usually follow a locative case suffix if one is present in a question?

Many Thanks

The question marker questions what immediately precedes it.

So in your first example the question in English is ´is it in Istanbul that you live?´ (as opposed to any other place) 

But I think you can also say ´Istanbul´da yaşıyor musunuz? Do you live in Istanbul?

In the Bursa example if you asked ´Bursa´yı mı seviyorsun?´ that´s like saying ´Is it Bursa(in particular) that you like?´ rather than just ´Do you like Bursa?´

My try

PS-if PDQ Turkish is all you have try Teach Yourself Turkish too.

Thanks for the explanation sonunda. Is this the ´Teach yourself Turkish´ you refer to: http://www.amazon.co.uk/Teach-Yourself-Turkish-Book-Languages/dp/0340871059?

My understanding as a learner is -

Istanbul´da mı yaşıyorsunuz? Is it Istanbul you are living in?

Asking you to confirm it is Istanbul, or which city it is, where as

Istanbul´da yaşıyor musunuz? Are you living in Istanbul?

Asking you do you reside in Istanbul, as opposed to maybe visiting Istanbul.

But wait for an expert to confirm my thoughts.

Where the question tag ´mi´ is located determines what is being questioned.

Yes or if you just want the book and not the cds

http://www.amazon.co.uk/Turkish-Teach-Yourself-Complete-Courses/dp/0340871040/ref=sr_1_2?ie=UTF8&s=books&qid=1274880493&sr=1-2

Thanks for your reply Henry. I´ve just noticed my typo on "Bursa´ya seviyormusunuz", I of course meant Bursa´yı seviyormusunuz

 I agree with Henry and Sonunda.

Just a couple of "picky" points:

Istanbul´da mı yaşıyorsunuz?   (needs the apostrophe as Istanbul is a proper name, and the da is written together. da written separately means also, too)

Bursa´yı seviyor musunuz? (it is -i sevmek not -a sevmek. Also, although you will often see it written together, the correct way is to put a space between seviyor and musunuz)

....and the seviyor musunuz should be two words.

 - sorry my note crosses with yours 

 and crossed with yours, too, sonunda!