Internet Explorer 7 has a new search box that allows you to easily search using your favorite search engine.  This box is highly customizable.  For example, you can easily add Yahoo Finance to the list so that when you type in a stock symbol you can get the latest stock price.  Once cool web site that will help you add and find these options is called www.OpenSearchList.com.  There, you can find many more custom search items that allow you to search specific web sites, blogs and more.

1. Visit OpenSearchList.com
2. Click on the item you want to add. IE will take over.

Thanks Polarman for recommending OpenSearchList.