i am a cakephp developer and working on a bitcoin plugin for my online shop right now
the plugin is open source MIT and the first tryouts can be seen here:
https://github.com/dereuromark/CakePHP-Payment-Pluginif anyone is interested in joining in or knows PHP/CakePHP, feel free to help making this a solid plugin for webshops.
i think it will really help the community as it provides another payment systems for shop owners. the more shops the better for bitcoin

there are already plugins for other shop system like OtCommerce, but for pure PHP or CakePHP there is not much at all.
the basic idea is that the php script asks the daemon every few minutes about the pending payments.
if the payment is received with enough confirmations the callback fires which then sets the order to "paid".