What is the best digital camera for real estate pictures???

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Something with 4 megapixels :-)

I would probably recommend a camera with the widest lense possible. If you're in a tight space, yet need to take a photo, the wide angle lense can make up for the lack of space. Unfortunately wide angle lenses can be somewhat expensive, and found more on SLR style cameras. In the area of point-and-shoot cameras, The Sony DSC S600 and the Kodak V570 both have wide angle lenses (Kodak wider than the Sony).
Links provided below, hope that helps.