I guess this counts as a gadget. I just installed a very slick utility for Outlook called Lookout. It does blazingly fast searches across the email, schedule entries, contacts, etc. in your Outlook files; it can even index your documents. The speed makes it so much more useful than Outlook's search functionality. Like Google, it makes it practical to query over your data to find stuff rather than having to try to organize it.

Microsoft liked this so much, we bought the company, Lookout Software You can download it for free here.