Creating web services

I can find bunches of examples of using the get handler when creating web services via Apex (under the SQL Worksheet section), and the documentation only seems to cover "GET" as well.  However, I can find nothing on creating, much less using, the other handlers (DELETE, POST, PUT).  I've googled until I'm blue in the face and scoured the documentation... Can someone point me in the correct direction, i.e. to examples, how-tos, etc.?

Thanks very much for your time!