Photographing Coins

Any tips for doing this? I made my first attempt today and discovered it's VERY difficult. I have a Canon SD700IS, it took a lot of "trial and error", the results weren't too bad....you can see the close-ups in my other thread.

For my pics, coins were placed on a black surface at a slight angle, then a desk lamp was placed about 6" from the coins. I used macro mode, played around with the ISO settings, changed the light settings (cam menu) and eventually used black and white to get what I thought were the best pics of my Morgans. Still think I can do a lot better! Of course, I don't think B&W is going to work with anything but silver coins.

***Edited by Forum Dad to move to photography forum***