This tool for building ScrAPIs is an interesting development—the current trend for not providing a simple API (or even a simple RSS feed) is being interpreted as damage and routed around.
A handy step-by-step guide to scraping HTML to get data out. Useful for services (—cough—Twitter—cough—) that keep changing the rules of their API use.
A new feature on Matthew Somerville's brilliant train timetable site. Just put /fares at the end of any URL to get the cheapest available fare.