Soemtimes I want to create a shape in Photoshop. Let's say it is an 8: 2 circles partially overlapping. I'll make the first shape with the circle marquee, fill it in with the right color, then duplicate it and move it accordingly. The problem is, you can see the edge of the second shape. I have to brush out the edges every time. If I create a shape with the marquee/fill technique, then try to delete it, it leaves a ring where the shape was, even after I hit Deselect. Is there something I can do to fix this problem, or is this a quirk of Photoshop? If it matters, I have a PC, PII, with 192 Mb of RAM.

I'm not really sure I understand you, but there are a couple of ways you can aproach what I think might be your soulition. Once you have created the shape you desire using the "Marque, Lasso, etc". Go to the "Channels Tab" besied the layers tab. Create a new channel by clicking on the new channel icon on the bottom. Once you create your new channel, you should automatically be there with your entire image in black, and the Marquee selection still selected. Fill up the selection with white...once filled in white you can deselect. Now this new channel you just created will be sort of a stencil for your shape...all you have to do is click on the "Load channel as selection" button, that is the firt button at the bottom of the channels pallete, and it will automatically load up the shape you had created. With the selection loaded go back to your layers pallete making sure that the "Red, Green, Blue" channels are showing so that you won't be seeing all black. And in a new layer with the selection already loaded just fill with the desired color. Just go back and forth from your channel that you created, load the selection, and back to your layers, and fill the selection. I hope I that help you out in any way..and since i wasn't sure if you were familiar with channels, I tried to be as informative as possible. If you are going to be using the shape that you created over and over again, and just filling them up with colors, It's an easy way to do, and you get and exact duplicate only different color. Another easier way to do it is, once you have filled up your selection with your desired color(make sure your filled up shape is in a new layer), just make a duplicate layer, then go to "Image->Adjust->Hue/Saturation" and click on the check box that says "Colorize", and move the Hue and Saturation sliders to get the color you want.

Could you just use the same marquee and just use fill, except on different layers? Just move the marquee around to where you want the next one.

You could do that too, there's more than one way of doing things in photoshop...what ever works for you.