jSeblod CCK brings Subcategories to Joomla 1.5, and you are going to understand how it works.
In order to manage your Categories and your Subcategories you just have to continue to use the Category Manager of Joomla.
At first you will see an additional column which is the "Parent Category" column (cf below). The Parent Category Title will appear if there is one. (there is not hack..... but only a good integration)
Like all other Joomla content plugins, you can integrate RokBox plugin in your content type. That means you can control any parameters of RokBox plugin with jSeblod CCK fields (No more need Joomla plugin button).
A RokBox CCK Pack is ready to be downloaded in the CCK Pack Directory. It includes 3 content type examples (RokBox Image, RokBox RemoteSite and RokBox YouTube) and all CCK fields which match with RokBox parameters. How to do?...
You can download jSeblod CCK RC 4 in download section. The simplicity of jSeblod CCK (Joomla Content Construction Kit) is increase by adding two big and exclusive features:
an amazing Translation Manager (in Article Manager)
I tried a lot extensions and different concepts in the past, but i am really confused and excited. Your backend looks great, no doubt. I guess, i have only seen a fraction of the interface and possibilties.
YES! jSeblod team is very proud to annouce you jSeblod CCK STABLE. 
Like all other Joomla content plugins, you can integrate RokBox plugin in your content type. That means you can control any parameters of RokBox plugin with jSeblod CCK fields (No more need Joomla plugin button).
You can 
You can download jSeblod CCK RC4-2. Here are some fixes, and small improvements before Christmas.
You can download jSeblod CCK RC 4 in download section. The simplicity of jSeblod CCK (Joomla Content Construction Kit) is increase by adding two big and exclusive features: