BrowserMob Open for Business
BrowserMob uses networks of real browsers around the world to provide more authentic load testing than simulation. Leveraging Selenium it allows recording. They’ve used cloud computing services like Amazon’s Web Services to keep costs down.
From their announcement:
BrowserMob is the world’s first load testing service that uses real browsers (Firefox 3.0.3 to be exact). It’s on-demand, low-cost, and super easy to get started with. And best of all: you only have to pay for what you use.
Read all about it: http://blog.browsermob.com/2008/11/open-for-business/