UK Postcode Googlemaps mashup

Everyone else has done a mashup so I thought I should do one too. My mashup combines GoogleMaps with StreetMap.co.uk's GridConvert to get the nearest postcode for a given longitude and latitude. I had to use some server side PHP to get around cross domain scripting issues and to scrape the postcode from result HTML, but other than that it's all through the GoogleMaps API.