So I took a look at a few of the coins that have had 0 Volume within the last 24 hours.
AeroME: Dev's last post on Bitcointalk was June 19, 2015 and http://aerome.org website is down. Probably save to say this one is over.
ArbitCoin: Last tweet was May 31, 2015. http://ww2.getaugmented.net is down. Last post from the dev on bitcointalk was June 6,2015. Probably safe to say this one is over.
Diggits: Definitely appears dead. http://www.diggits.co is offline. Facebook page is gone and all other activity from them ceased in September 2015.
That's all I've got for now...
NOTE: @bittrex-bill, your post is trying to include the . in your url linking to https://bittrex.zendesk.com/hc/en-us/articles/202583874-Bittrex-Market-Removal-Policy-Updated-06-21-16, resulting in it leading to a bad page.