I was there at the Singapore iPhone 3G launch over at Singtel ComCenter which happen at midnight on the 22nd August 2008. I reached there at about 9.15pm and started queuing. I was the 43rd in the queue according to the sticker pasted on my application form.
There are 2 parts of the queue, the first part (Killiney side) is where you queue up and then the part time sales people will write down all your details in the application form as well as the equipment form. Once you are done, they will bring you in batches to the second part of the queue which is in front of the glass house. You will wait at there till midnight. There is a live band EIC and Glenn Ong from Class 95 to entertain you. I brought my laptop along as well so I can provide live updates on Hardware Zone forums.