Where can I trade my altcoins? I'm looking for an exchange to trade my altcoins against each other to take advantage of the volatility. Any suggestions for altcoin exchanges?
Crypto Street is a platform launched to do exactly this. We support BTC, LTC and FTC for now. We plan to add additional altcoins as they prove viable or in some way substantial.

(DISCLAIMER: I am one of the owners of the site).