I'm not sure about the exact date, but I would imagine in the coming weeks.  The swap from the old block chain to the new one finishes up tomorrow.  This means that CMC will have an updated market cap soon, putting CSC in the top 200 coins as of current value.

I think it's a short matter of time before exchanges realize there's something to be made trading CSC.

As far as Alcurex goes, I've done several deposits and withdrawals from there without any concern so far.