Yepp. It is released, and it's the best thing since sliced bread... It REALLY is. It's a lean, mean anti-malware machine.
If you're still one of them "norton is a resource hog"-advocates, either TRY IT, or just stay ignorant (I'm writing this post mainly for YOU. It's time to wake up ;) ). If it bogs your computer down, there's something wrong with your computer, not the software. If my old box (athlon X2 6000+) can run it without me even noticing it, then yours should too.
As the main computer tech for pretty much every non-tech-type I know, I hugely appreciate some of the new features. The online database... It's just incredibly smart. It monitors all software you download and run, checking it against an online database. If anything you try to run is not in there, it'll alert you on the fact. It'll tell you there are very few other people with that particular software installed and because of that it's fairly untested, even though scanned clean by the software. It's an AWESOME feature for people who install crap all over without knowing what they are doing. That'll keep them alerted when they installed software (or the latest version of whatever) that's not widely used yet. It can be disabled, but I actually found it handy to be alerted about that during the beta. I wouldn't be at all surprised if they start to add reliability info into that feature, so I'll get alerted about unstable software before I even install it ("this software is known to be unreliable on windows 7"-style popups). By the way, this feature actually does add noticable lag when installing/running new software (takes some time before the alerts pop up and I can decide wether to actually install or not). But since I don't install software very often, I find that a minor inconvenience, and keep it activated anyway.
As for catching malware, it still remains to be tested, but I really can't see it doing any worse than NIS2009 and 2008, which had top results for every test thrown at it (only lagging slightly behind on the heuristic bit, but seriously, with being updated dozens of times/day, the risk of getting a 0day virus on a home computer is slim to none unless you're playing with 0day warez, and we all know better than doing that, don't we? ;) ).
I'm not much of a review writer, so I'll just hush up now. :P
EDIT: By the way... If you're running a NIS 2006 subscription (or later), the upgrade is free... You're a fool to not upgrade, this is by far the best version yet.