The Open Weather Map PHP Library enables users to parse weather data and history from the Open Weather Map API. The library also tries to normalize and abstract the weather data to remove inconsistencies.
PubSubHubbub. Say that three times fast. If you're not familiar with PubSubHubbub, it's an extension of the RSS and Atom protocol that allows the feed to push content out when it's updated. That's just the sort of technology we should see from check-in APIs like Foursquare and Gowalla.
Cycling in the UK is not only a popular past time but and also a real commuting choice. The UK has numerous defined cycle routes and many towns and cities have designated cycling lanes and more recently London introduced a cycling scheme fondly referred to as Boris' Bikes after the current Mayor of London. Since more and more people are using a bicycle as a preferred method of transport, and with cyclists having a different selection of routes, on top of the ordinary street network, than alternative transportation methods, it makes sense for there to be a need for a bicycle journey planning web application and API.