As this API has just launched, it is highly advisable that you let me know if you build an application so I can contact you should any of the API details change - it's also great to see what people are building and take your feedback on board to improve the service! Alternatively, you can subscribe to the web log on my website or follow @WikiLocation on Twitter for all of the latest updates.
If you've found this service useful, then donations of either time, ideas, or plummeting sterling are always gratefully received! If you have any specific ideas of how to improve this service or would like to help out with a few ideas of my own, then please contact me.
If you'd like to make a donation towards the cost of my bandwidth (which is quite significant bearing in mind I download Wikipedia's database on a weekly basis!), then please use the donate button below to make a secure donation through PayPal. All donators receive a nice email and a warm fuzzy feeling inside.