Sobi2, is most probobly one of the best directory style components out there at the moment. Perfect for any category based listings system, such as yellow pages style directories. The ability to have an unlimited number of categories is fantastic, instead of being tied into the section / category system of Joomla, which might suffice for normal sites, but falls apart when you look at multiple level directories. The modular nature of the component, through plugins available makes adding extra features such as Radius Search, or Featured listings very simple, bringing further options to your site.

I would highly reccomend this component to anyone wanting to start a business directory.