I wrote a new article to Nokia Developer Wiki. This code example demonstrate how to take an image, record audio or video and save these captured media files to the Isolated Storage with the location information. These Interesting Places with media files can be later viewed and shared to the server side. This code example uses PHP server as a back end of this application. All captured media files are send 500 kB chucks with RestSharp and parsed together in the server side with PHP. This application is tested with 5 min recorded video (for example), then video file size was 55 MB and sent chucks count was more than 110. Sent was tested over normal cellular network and sending takes about 8 minutes. It worked really nice in Windows Phone 7 without Background Agents.
You can read the whole article and download source codes from: Creating an Interesting Places application - take and share media in WP7.