digital camers do alot of the work for you. i'm no expert, but i would make sure you have adequate light and make sure there are no other distractions or objects around the cake. You can use sheets or fabric as a background to help compliment your cake.
hope this helps a bit.
christine
I usually stand on a chair to get a good shot of the cake from the top and I take a few pictures with flash and a few without you can always delete the ones that don't look good. It's better to have too many shots to pick from than too little that are wrong angles or colors.
Jackie
This is a great thread--I have many inferior pics to prove it!
Standing on a chair is great advice IMO, because otherwise you get that weird trapezoid effect when you go to crop a photo of a sheet or square cake.
Think about what you put the cake on and next to (forgive my prepositions all over the place). I have a couple of great cake photos--except for the bottles of juice in the background! A trick I just learned is to push a table against the wall. If you have two pieces of posterboard that are the same color, tape one piece to the wall and set the other piece under the cake. Of course, if you have a beautifully set table (or a wall and tablecloth that are the same color), you won't need that trick!
Also, I have a digital photo program called Paint Shop Pro 5. I'm not a computer software expert, but it has an option called "Quick Fix," where you click a button and it adjusts the lighting and clarity of the photo for you, as well as an "adjust wizard," that lets you choose between three examples of the same photo for light exposure, color, sharpness, and one other quality. This tool has been really helpful to me in getting photos on my website.
I still have a lot to learn, but I'm loving this digital camera technology!
I just take a picture under a light without a flash...
I usually turn off my flash too, because I find that there's too much glare, especially when your icing is white. I take quite a few and then delete all but the best 1 or 2.
the glare is the problem I have, I also stand on a chair and make sure only the cake is in the picture. You could also take your cake outside in the daylight if you have a patio table or something to put it on....I have learned that natural light is much more flattering to anyone or anything.
JMO! 
This is where the quality and amout of pixels your camera has. The majority of digital cameras in an affordable range allow a lot less light in than a normal camera and you cannot adjust your aperature or f-stop or control the shutter stop speed for light and movement control. Only a $1000 plus digital allows adjustment of this which is the closest thing to a real camera. The truth is most of our std digital cameras cannot even provide a better picture than a disposable camera. The best pictures you will get will be 1 of two ways with a std digital camera. 1. Have 2 light stds with lights positioned on each side of the cake pointed at a 45 degree angle down at the cake. This eliminates shadows and provides proper lighting for a good picture. Make sure you do not put the lights too close or the digital camera will provide more of a soft greyish atmosphere around the cake. It's not bad but not the best picture when this happens. 2. In dim lighting stand back from your cake and use your flash and zoom. This works well because the flash will not overexpose the cake creating glare and white out of the cake. It provides just enough light for a very good picture. This is the easiest way and least expensive of coarse.
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