domain name system - High Availability DNS Hosting Strategy?

I'm trying to find a few options of ways to do high availability DNS hosting for a few existing websites. This morning, the company I work for was brought to its knees because the DNS hosting we have for our domains through our registrar (bulkregister.com) went down. I'm now being tasked with finding an alternative which will not put us at the mercy of a single DNS provider.

What we're looking for:

No single point of failure.

Time effective.
- One solution that has been suggested is to do multiple DNS hosts. This seems like a great alternative, but we have over 20 domains, and updating an IP address on all of those domains across two providers is prohibitive.

Cost effective.
- I have to sell this to upper management. Joy is me.

So what methods exist which support this? I'm more of a programmer myself, but they've tasked me with this, so I wanted to get the opinion of people more experienced than I am.

Answer

You can use any number of DNS hosters that have geographically dispersed name servers.

http://www.dyndns.com/services/dns/custom/

http://www.easydns.com/dnsmanage.php3

You could also move your name servers and DNS zones to a registrar that has a more robust and resilient infrastructure, such as Network Solutions.

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