And more links: http://groups.google.com/group/web2py/browse_thread/thread/ab2cb938413e7be/23df7270902aa957?lnk=gst&q=how+to+post+a+file+to+a+service#23df7270902aa957
Seems like things have changed over time. So question of what's the latest approach seems OK. Basically, how to POST a file to a service and how to catch it on the server side.