Distributed DNS Tools?

[Scott Baker]

I work for an ISP and every now and then we'll get a host that won't 
resolve. Usually it's some weird configuration on the other end, or recent 
changes that haven't fully propagated yet. Are there any good tools that 
will check a given DNS host from servers around the globe to see what other 
servers think of a given host?

I used to have a web page book marked that would let you feed it a host and 
it would check a bunch of DNS servers and report back failure rates in 
percentages etc.

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Scott Baker - Canby Telcom
RHCE - System Administrator - 503.266.8253