So how can we now a website is working how it should.
As far as performance, server settings, code etc…
Well there are lots of tools out there but the best ones I have came across are:
Firefox AddOn Firebug
YSLOW a addon for Firebug
IBM page detailer (old but great!)
Google Wbmaster (not sure), must login in gmail plus insert a metag on the website page.
I have also being using stress tools like Visual Studio 2008 Test Load, wcat, etc…
Any other web performance test tools?