Loved giving this talk at PHP Day in Verona - I hadn't spoken in Italy before and everyone was friendly and super-helpful, Verona is beautiful and I had a really excellent time! My audience were great and asked some good questions which I always enjoy - in theory this is a talk I've given before, in practice it comes out different every time as I work with more APIs and bring different experiences (war stories!) to the proceedings.

http://www.slideshare.net/lornajane/best-practice-in-api-design