If you consistently have several spots on your photos in exactly the same place and with any lens you use, think about this possible problem. SLR advantages is that you can replace your lenses but every time you open your camera, there is a chance that dust came inside. In this short article I will present how it looks like and next week I will write about sensor cleaning and testing what have you done with cleaning tools.
The best example to see your sensor dust is when you take a photo of a uniform color (for example photo with a blue sky) with closed aperture (for example F16 and above). If you have a dust, you will see the spots on your image and they look like someone has taken an eyedropper and dropped a few drops of water on the photo that dried out and left a water stain. The area in question is slightly darker than the rest of the image.
Next image is from my Canon 350D. Click on image to enlarge.
Well dear friends… Dust is here and now we need to remove it…
Stay tuned 
Desktop computer printer is the best option for your instant image printing from a digital camera printer port or easy share feature enables you to automatically print by your camera menu and canon printers support such features.
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Sign of a dirty sensor…
If you consistently have several spots on your photos in exactly the same place and with any lens you use, think about this possible problem….