https://bitcointalk.org/index.php?topic=609520

when an exchange kills a coin, it should follow a protocol:

suggestions:

• give enough time between announcement and death
• alert the users, preferably by email (not everyone is daytrading)
• a mailinglist that users can subscribe to might help, to be informed about important events
• cancel all open orders of that coin, put them back onto balance
• keep the balance reachable for a few more weeks, to allow for withdrawal

what else?

discuss it here: https://bitcointalk.org/index.php?topic=609520