How about one about Lens Hoods. Their uses, advantages, disadvantages and is it really worthy to have one.
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http://flickr.com/photos/sreejithk2000
Nikon D40
AF-S DX NIKKOR 18-55mm f/3.5-5.6G | AF-S DX VR Zoom-NIKKOR 55-200mm f/4-5.6G
AF-S DX NIKKOR 35mm f/1.8G | AF-S Micro-NIKKOR 60mm f/2.8G ED
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