More and more frameworks show up every day, and each framework tries to address and handle slightly different needs. As a bonus, some frameworks add options into the WordPress administration panel that allow the end user to add and remove features to/from the child theme they've selected.

The right framework for you will depend on your development style and the needs of your site, but some popular frameworks are listed next.

Themes that offer a lot of child themes which you can customize yourself:

• Thematic (http://themeshaper.com/thematic/)
• Hybrid (http://themehybrid.com/)

Premium frameworks with additional features are as follows:

• Carrington (http://carringtontheme.com/)
• Thesis (http://diythemes.com/)

In fact, there are many theme frameworks available. A quick Google search for "WordPress Theme Frameworks" will turn up quite a range to choose from.