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I thought keeping this list updated could be useful for others. Here are the ones I know:

Does anyone know of any others?

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closed as not constructive by Mark Henderson Jun 12 '12 at 11:37

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Anchor Systems can do that; they'll also do IP failover on your dedicated systems (and anything else you'd care to mention). Disclaimer: I used to work for them, but they certainly don't pay me anything to spruik their stuff any more.

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Cool! Their blog seems very useful too. – dgo.a Jul 23 '11 at 13:41

Zoneedit or EasyDNS offer DNS failover... works with any hosting provider

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Really, really, REALLY not the same thing. – womble Jul 23 '11 at 14:56

Many VPSes that don't explicitly support IP failover can be configured to do so by using a tool like heartbeat along with the proper reconfiguration scripts. An example is EC2 with elastic IPs.

Configuration example:

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