Choosing a lens is a difficult task for a confirmed photographer, and a harder task for a beginner, even with the help of review sites such as photozone.de and dpreview.com.
The first step is to know what you want, decide what kind of photography the lens will be used for. Then you need to set up a budget, and gather information on lenses that fit both your budget and needs. Finally you are ready to dive into the reviews, compare the models and make up your mind.
lenshero.com proposes to simplify this work. Fill in your budget, camera model and needs and go! LensHero will print a list of lenses which could fit your request and give a short review on each model. It is then up to you to deepen your research and go further in the details, but it's a good start!