Netscape 9 is Firefox with a Netscape theme. Just download Firefox from mozilla.com.
I will miss the Netscape name. Reminds me of the wild days of the internet back in 1995. Just after Algore invented it. I used Netscape for years until I switched to OmniWeb then Safari on OS X. Now that I am back on Vista, I was using Netscape 9. Not sure what I’ll use now.
If you add the Netstripe theme to Firefox, you'll have Firefox looking like Netscape. It's the closet you get to having Netscape 9.0.0.x without actually having it.