Tools for Stress Testing Websites?
rickindy asks: "What do you usedfor web site load testing tools? Open source or commercial is fine, but my employer it hosting a boatload of sites, and we would like to find the breaking point for the server at some time other than 3:00am."
I think this link can be helpful for you, it provides a huge list of web test tools. They are organized in categories for which sort of test one would like to perform. They also have a FAQ which answers several questions about how sites can be tested, and it also points out what things you should think about, like; what are the expected loads, who is the target audience, what kind of performance is expected on the client side, and so on.
2 reptiles beneath your current threshold.
http://www.acme.com/software/http_load/
This will probably get me strung up.... but Microsoft have a free one called the "Web Application Stress Tool".
Might be worth a look if you have an MS Box to run it on.
Learn to Improvise
There's the Jakarta project's JMeter, from the folks at Apache. It's written in Java, but can be used to load test a wide variety of network resources.