The Mersin, Turkey to Latakia (alternative spelling: Lattakia; in Turkish: Lazkiye) Syria international ferry will restart on 28 June for the 2007 summer season.
In 2006 the ferry cost USD 48 one way and USD 96 return and ran Mondays and Thursdays, departing Mersin at 9 AM and returning from Latakia at 2 PM. I will update this post when I hear the prices and schedule for this year.
Thank you Christel for the tip!
UPDATE: The 2007 ferry schedule is the same as 2006’s: departing Mersin at 9 AM on Mondays and Thursdays and returning from Latakia in the afternoon on the same day. The cost is $65 one-way and $130 return, more than 30% more expensive than last year. Merlat sell tickets: telephone +90-324-237 1668.
NOTE: some advice from Adam in comments:
…these ferries don’t seem terribly reliable … the one on Monday 13 August 2007 was cancelled altogether. Check and double check, if you’re thinking of using it!