DomainDiscover is quite good
More than $19/yr (IIRC it's $25) but it's worth the great accounts dept they have, and a real web interface for managing your domains. Unlike NSI, I was able to consolidate our company's six names into one account, for example.
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A stupid despot may constrain his slaves with iron chains; but a true politician binds them even more strongly by the chain of their own ideas;...despair and time eat away the bonds of iron and steel, but they are powerless against the habitual union of ideas, they can only tighten it still more; and on the soft fibres of the brain is founded the unshakable base of the soundest of Empires."
Jacques Servan, 1767
