Kate Russell's weekly review of new and interesting sites and apps.

Prezi is the place to go to spruce up your presentations with some impressive graphics.

For Facebook users, Socialfixer is a useful tool that customises the way the Facebook interface looks, including removing some of the updates made in the past.

Inside the World of Dinosaurs is an interactive encyclopaedia for iPad.

Another example of this genre is Cyclepedia, which celebrates 100 bicycles that changed cycling history.

Barefoot World Atlas app is launching, specially engineered to take advantage of the new Retina display and quad-core graphics on the iPad 3.

And finally, become the Doctor's side-kick with this new browser-based multiplayer role-playing game, Dr Who, Worlds in Time.

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