Yelp Widget Pro makes it easy for you to add business listings to your website or blog via an easy-to-use and intuitive widget.
A view of the Yelp Widget Pro Settings page displaying the metabox to enter in your Yelp API v2.0 Information
Many plugins don't have the option to disable CSS - this one does. If you want to style the plugin to suit your needs then enable this option.
Yelp Widget Pro expanded displaying all available options as of version 1.1
How the widget looks in a website sidebar