Working with the SharePoint 2007 Search Web Service
I've been working with the SharePoint 2007 search web service recently... Did you know that you can call the SharePoint search engine from other applications? Very powerful! The challenge, as in calling most web services, is getting the input syntax right so you can get your expected results. In my research, I came across a very nifty tool; it's a Windows Forms UI that acts as a test harness for the SharePoint search web service.
Here's a screenshot...

It gives you the ability to understand the input and output XML... and sure beats having to dig for documentation!
To download a copy, go to: http://www.mosssearch.com/searchwebservice.html