Like I said I can maintain a fairly good list if need be.
We can see your “fairly good” and raise you a “comprehensive”:
* Listed by name: http://minkiz.co/coin/name/
* Listed by symbol http://minkiz.co/coin/symbol/
* Listed with mugshot http://minkiz.co/coin/
We're striving to publish the list as Linked Open Data - there's a LOD browser (http://minkiz.co/lod), a SPARQL endpoint (http://minkiz.co/sparql)
and an associated OWL ontology specialised to cryptocurrency: DOACC, a Description of a CryptoCurrency, browsable on http://minkiz.co/ontology/doacc.
It's all published as Open Source ofc (both abox and tbox): http://github.com/DOACC
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It will be all relative determination . At least and update on each coin that is close to death can take place in the updated thread.
The absence of a complete list may have caused you to underestimate the magnitude of the task.
Cryddit maintains the Necronomicon (https://bitcointalksearch.org/topic/necronomicon-thread-altcoins-which-are-dead-588413), a list of dead coins, published as an updated thread. Nice effort, shame about the publishing engine, we thought - hence our taking the Linked Open Data route.
I strongly urge you to heed the caveat about the difficulty of working without an operational definition of your primary discriminator. And at best, it can only be an ostensive definition (http://en.wikipedia.org/wiki/Ostensive_definition) with all the contention and controversy that implies.
Cheers,
Graham
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when pow over , all coin seems like to be a dead coin 
