ORM with Validation in Kohana 3
It took me a while to get this working correctly and I'm betting I'm not the only one. This example will give you everything you need to setup user creation with ORM and model level validation.
Linking to YouTube on Mobile Websites
Launching a native video player via the HTML5 video element if possible is the slickest way to handle video on mobile websites. An alternative that requires less development and QA time is simply uploading the video to YouTube and then linking to it. This approach has the advantage of letting YouTube deal with optimization, CDN (content delivery network) caching, and also having the video play on BlackBerry and Windows Phone 7 which can be problematic (also not likely worth the effort) to implement yourself.
Developing Web Pages for BlackBerry
You may not use one, your friends may not be using one, but the people who sign the checks for large mobile web project likely are. BlackBerry (BB) is still a large part of the smartphone ecosystem and any mobile web project should have support for BlackBerry.