p {
color: blue; All browsers
color:red\9; IE6, 7, 8 only (Has to come before the other IE hacks for inheritance to work)
/color:green; IE6, 7 only (Has to come before the IE6 hack for inheritance to work)
_color:yellow; IE 6 only
}

p, x:-moz-any-link { Firefox only
color:black;
}

Additionally, here’s how to target IE 6 and 7 together:

p {
*color:black;
}

It’s simple to install, and it comes preinstalled with IE6. You don’t even need a serial number for XP. Just follow the steps on the page (they’re surprisingly straightforward) and you’re golden. The only thing that was even slightly tricky was configuring BIOS if your hardware virtualization isn’t turned on, but I managed with no problems, and I never do any configuration.

I never thought I’d say this, but “Thanks Microsoft for this helpful development tool.”

Installation page: http://www.microsoft.com/windows/virtual-pc/download.aspx

BIOS configuration instructions: http://www.microsoft.com/windows/virtual-pc/support/configure-bios.aspx