The second phase of the Challenges beta has begun, so it's time for you to help find our first winners. The beta is going well, with a large number of excellent photos being submitted and a small number of bugs, quirks and missing features being identified. But to really understand how votes are going to work, we need a lot more of them. So we invite you to take a moment to look at the challenges, vote for the images you like and help both to improve the system and select some worthy winners.

Click here to view the challenges and register your opinions