SecretLeeds - History, culture and architecture in Leeds

The Ordnance Survey have opened up access to their datahttp://openspace.ordnancesurvey.co.uk/openspace/index.html

And if you dont feel like giving all your personal details and having to sign up, you can use Magic maps, the other Government mapping service. Especialy good for looking at the "built environment" and uses the same data-setshttp://www.magic.gov.uk/website/magic/