General WebServer Question?

Can anyone recommend (or is there) a utility / app that I can use to hit my webserver (say from another computer outside my subnet) -- any number of times to get an idea of performance - based on my bandwidth and hardware? In other words -- I'd like to do some hard core testing of my website and see how much my pipe and servers (simultaneously) can handle... I would like to get page return times, etc... Also -- is there a good add on to IIS or Apache that I can use to monitor not only how much traffic is hitting my site, but which pages, and from where the users are coming (ie. which websites they came from)? Thanks. Jason