What tools are best for measuring web-services performance?
It would be nice to get report for total transferred data, total POSTs, requests per second, time per req
I have used jmeter in the past. Check it out.
Not quite for web services, but a very simple command line tool is distributed with Apache to benchmark HTTP performance, it is called ApacheBench and can be found in the bin directory as ab.exe
ApacheBench's documentation
There is also http://www.soapui.org/ that our QA dept used.