Try DynDNS internet guide
http://www.dyndns.com/services/dynguide/ OpenDNS is probably just as good or better with most categories except what they call "spyware". Is quite effective and as far as I know the only free dns service offering this. OpenDNS suddenly found a way to block malware when business plan was in place.
If you sign up for an account you can actually disable landing page for unknown addresses. Of course they have one. Well then service is invisible unless something is blocked. In other words brilliant

If you just punch in numbers "spyware", phishing, conficker will be blocked. I also use spam, advertisements/popups. Dns blocking ads is not pretty but it seems their filter is mild. Not that often you see a Dyndns box. And way faster than waiting for blocking.opendns.com
Their source for malware etc. is Barracuda
http://www.barracudacentral.org/ Don't know them but so far so good. WOT has many more sources (forget users) so is "better" but this is dns = more powerful in some ways. Router is not the same as a browser plugin.
There are no stats like on Opendns. So obvious there will be a premium service but as long as they keep "spyware" category that is fine. Free version lets you add own domains and whitelist too - should Barracuda go too far. I would imagine "spam" category can be tricky. They seem strong with malware - can rarely be debated anyway.
Blain, try Linkextend for Firefox
http://www.linkextend.com/ That way you can see verdicts from not only WOT but also Mcafee Siteadvisor, Norton Safe Web, Browserdefender, Google and Web Security Guard. 9 out of 10 times you are on something really nasty you will find that only WOT knows the site

Rest are useless to be honest. Getting close to false sense of security. WOT has so many good sources blacklisting malware that there is no contest. And I will add if only they would focus on that... WOT is also about green sites = promotion and then you get eager advertisers or spammers. Ain't seen nothing yet but depends on popularity. For now it works ok if focus is on red sites. Few false positives.
If you even use Firefox you can move the green button for these services up next to "wonder bar". Will change unless full green for all. Easy to check which don't like this or that, and why. No need for a pixel eating LinkExtend toolbar. Most you probably don't care about. Check settings and disable away. Each button can be moved about.