Mrkeith if you look under Residency Application Assistance I have put details of how to go about going to police stations and government offices for your residency (post on the 26th of April).I have also put on there the documents you need to have copies of.
We did the application ourselves in 2007 and I am not aware of any changes to the system.
There is a charge at the PTT for the residency booklet which is also something you have to have the cash for,not only the residency fee ritself.
You need 10 passport photographs
3 copies of your passport photo page
2 copies of the page where your last tourist visa is located
(2 for the passport police and 2 for the Muhtar)
Make sure that you have enough time left on your passport for the number of years residence you want otherwise you may only get the number of years left on your passport.
1 copy of your passport photo page
1 copy of your bank statement or pension statement to prove that you have enough money to live in Turkey.
1 copy of your deed/tapu or rental contract.
Your passport
Cash for residency and also for the visa book itself which in 2007 was 70lira plus a small fee.
Your existing residence permit if renewing.