Question: I know of a couple tools to measure end user web site performance and I'm wondering what else is out there. The two major ones I know of are [yslow](http://developer.yahoo.com/yslow) and [Google's page speed](http://code.google.com/speed/page-speed).

Answer: 
Google has another tool within Google Webmaster tools. Go to your site within Webmaster Tools, click on Labs, and then Site Performance. This will show you what Google believes to be your sites overall performance and average load time. It will also list suggestions on what pages are slowing you down. The tool is relatively new and as such isn't great.

Microsoft provides a tool within the SEO Toolkit that is now included in IIS7. When you do a Website Analysis of your site it will tell you how long it took to load each page.
[Octagate's Site Timer](http://www.octagate.com/service/SiteTimer/) provides a graphical view of the load time if you want a web site, or you can get similar statistics with Chrome and Opera's developer tools.

![Octagate example result](https://i.stack.imgur.com/M0AA6.png)
![Chrome example result](https://i.stack.imgur.com/fxcap.png)
![Opera example result](https://i.stack.imgur.com/mlYj6.png)