The chain needs to be connected? D'oh.

Thanks to everyone for the comments.

Seriously, here's a pic of the chain line, or at least, the way the chain line was last March. It looks straight to me. If it isn't straight enough, how would I go about fixing the path?

I suspect chain wear, and am planning to upgrade the chain. I think it's the right size. It was a 1/8" chain on 3/32" cogs. I'm planning to go with a 3/32" chain this time around since Sheldon said to on one of his fixed gear pages.