IE8 search provider allows a prospective site visitor to search on a target site by simply highlighting the text and invoking search provider. To help with the holiday shopping needs Walmart.com team created a search provider that can be downloaded from http://www.ieaddons.com or from the shopping section of ieaddons.com: http://ieaddons.com/en/shopping/. Today Walmart.com search provider is being promoted on the home page of ieaddons.com as shown below:
For more information on how to create IE8 web slices and accelerators, please visit the following resource page I put together some time ago: http://blogs.msdn.com/hanuk/archive/2009/09/02/internet-explorer-8-ie8-web-slice-accelerator-search-provider-resources.aspx
It is very good!