For those who have hastily updated to 1.2, Optic is getting the server ready for the big update. If you currently have 1.2 and can't access the server, most likely he hasn't updated yet. If you made a back up of your original 1.1 minecraft.jar file u can use that to replace the updated 1.2 jar until Opticraft is fully updated. If you don't have a back up then please WAIT PATIENTLY! The server will be updated soon!
Here's Optic's update topic (lol who else noticed Optic is topic scrambled?
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http://www.opticraft.net/index.php/topic,7285.0.html