Firefox is able to use special hints embedded in web pages to pre-load other web pages that the user is most likely to click on next. Because the next page has already been prefetched it displays almost instantly.
In my spare time, I'm the webmaster for the Australian Carnivorous Plant Society. I'm currently working on a complete overhaul of their website, including moving to a new hosting provider. As well as making use of ASP.NET 2.0 for the new site, I've also made use of the sample Design Templates that make good use of Master Pages, XHTML and CSS.
This little guy and his friend (not sure where he is) had been living the high life in one of the holes dug for our retaining wall. Not wanting to see them end their lives encased in concrete, we rescued them both and left them in a bucket with a big rock in it.
I'm just glad they were in the shallower hole, and not the 2.5 metre deep one!
Here's a nice overview of how you can use the Web Test features of Visual Studio 2005 Team Edition for Software Testers.