Sitematch London has added 36 sites owned by national government departments to the site.
Sitematch London is helping international investors source new development opportunities during the 2012 Olympic Games.
Three more sites in Havering, all owned by the Greater London Authority, have been added to the Sitematch London database.
Sutton Council has found a buyer for one of its key development sites.
A government task force has recommended 'lending' developers public sector land, and free them from building affordable homes in private rented schemes, according to a report.
Ealing Council's director of property and regeneration Brendon Walsh is moving to Hounslow Council to take up a new role.
The government's regeneration quango will spend the next year getting surplus land owned by departments ready to be sold, it says.
Chief executive of the HCA has outlined the aim of speeding up the release of its land to the private sector.
The Greater London Authority (GLA) is working with Sitematch London on an event to promote investment opportunities across the city to UK and overseas visitors during the London 2012 Games - and London councils can get involved.
The Sitematch London website has been relaunched - with new features to make finding prime development sites even easier.