OpenSearch is a set of simple formats for the sharing of search results. Any website that has a search feature can make their results available in OpenSearch™ format. Other tools can then read those search results. For example, here is an aggregator tha
Enter a del.icio.us tag/username into the field below and press 'Go'. A random page from that tag/user will come up in the frame at the bottom and a link to bookmark the shown page will be given. For more information read about it on my blog.