APIs & services

Maps

• OS OpenSpace - free Ordnance Survey maps
• Google Maps
• Polymaps
• Cloudmade
• Open Street Maps
• Open Plaques
• NLS Maps
• Pleiades

User Data

• Facebook Graph API
• Facebook Auth (user profile, email, likes etc) works on web, mobile web, mobile apps and embedded devices
• Facebook Places (search, post checkins, get user and friends checkins)
• Facebook Photos (all photos a user is tagged in, with timestamps)
• Facebook Wall (all posts by a user and their friends on their wall, with timestamps) 

Timeline & Visualisations

• Simile Timline
• Protovis
• Dipity
• Many Eyes
• Culture Maps software

YQL tables for accessing APIs

• Museum of London - example search for events
• Brooklyn Museum - api key needed
• Digital NZ - api key needed
• Victoria and Albert Museum - example search for wine
• British Museum - searches the opensearch feed; example search for Egypt
• Black Country History - example search for painting
• Opencontext  - example search in a bounding box
• Uk postcode - example search on BM postcode lat/lon
• Theyworkforyou - api key needed

Simple example of multiquery search for Egypt using YQL across several apis. 

Photos

• Indicommons API to The Commons on Flickr
• Suggestify (open-source code)