Creating a mobile site

So I have been trying to get my new mobile site up and running. Of course at this stage I should be concentrating on the back-end and how the application side of things work. However I just can't help wondering what the site looks like on a mobile phone - principally the N95 8GB.

So, thanks to the wonder of wireless I have been able to test my site a little on my phone over my local wireless network. One thing really bugs me though. The horizontal scrolling. It is so hard to get rid of!! I have, currently but I haven't tested in depth yet to see what element actually causes this.

I normally for mobile devices use margins and padding set to 0 on most elements, but the phone doesn't seem to obey this rules all the time. Is it just me or is it temperamental..?

I have about 50 mobile sites bookmarked on my phone, but most of them have some horizontal scrolling which is a bit annoy - not least that the <div>'s don't fill the page when you scroll. BBC is a prime example. I mean, I love that site but why does it have to scroll..