The new rooftop extension of The Photographers' Gallery at 16-18 Ramillies Street is looking good. This, the largest public gallery in London dedicated to photography, is due to reopen on 19 May. So far it has raised about £10,000 toward the £30,000 cost of the extension with its buy-a-virtual-brick campaign. It is a registered charity, so feel free to buy a virtual brick if you have the readies. Click the title link for more information and to sign up for an e-newsletter to keep you updated on new exhibitions.