I'm at the moment in a netcafe in Chios, just came from Cesme this morning. The ferry to Piraeus is not running everyday, so you need to check its schedule. I heard it was sailing to thursdays and fridays. It is a over night cruse.
Other ferry-lines have stopped. Marmaris to Rhodos, and Kusadasi to Samos have stopped. The information you hear from the travel agencis, f.exp. in Istanbul, are not always correct, so it is the best way to get the the port and ask the local travel agency.
The ferry trip from Cesme to Chios (1hr) costs 60-70euru (with motorbike) and the trip Chios to Piraeus (10hr) cost the same.
Hope this is usefull.