Why another framework
Why another framework isn't the coreect question, I suppose the question should be why not the Zend Framework, CI, Symfony orr another of the other tools out there, the quick answer is familiarity.
The seeds of my framework data back to around 2001/2 when I created my first classes, form and database if my memory serves, between then and 2007 I'd built up quite a large library of code and also a method, it was a fairly simple framework that had served me very well over the years.
In 2007 I joined a small web design house and rose to Head of Development, they didn't have any systems in place so I decided to introduce my framework. Over the first couple of months I turned it into more a system and over the following 15 months myself and my team kept on adding to it, one of the largest additions being an XML form builder.
The system was capable but I always felt it was a little too simplistic, this didn't hurt too much because of the range of ability in my team, scripter to senior developer but it started feeling more and more wrong as I continued to use it.
Revolution
In mid 2009 I left and decided that I wanted to contract/freelance for a while, leaving also gave me the time to rebuild my framework. I've taken a copy of my original work, circa 2007 and am currently re-writing it to cope with all my future projects.
The library files are currently being released on this site, I'm hoping to release the framework sometime in 2010.