srl: With regards to Open Source version of MS's Webtool (see my last diary entry), there is the Apache project's JMeter which look rather good (it is in Java though, which may be a negative for some people). I'll try it out sometime and report.

There is at least one other Open Source Java webserver load benchmarking tool (OSJWLBT ?!?!) available. I can't remember what it is called, but I tried it, and couldn't figure out how to use it, and then I switched to MS Webtool.