The Sonoma partners have done many great things for the CRM community, they have an excellent blog, they have authored some of the best books on CRM out there and now and again they write an excellent add on for CRM and give it away for free.
This is some functionality which I have been asked for by customers previously. It gives you the functionality to search multiple entities at once.
The video below show the functionality in action
if you want to download the free solution then go to Pinpoint by clicking the link below and in exchange for you name and email address you get a free universal search tool in CRM
it can also be configured to specify which entities you want to be able to search.