Unfortunately, I have no advice for coming up with good titles. I wish I did. Most people I know wish they did.
When I make titles for my own work, I try to find something that either raises questions (i.e. something kinda weird that makes people want to look just to find out what it is) or something that relates to the story on multiple points - but those really aren't rules at all, more like starting points.

Does anyone else out there have tips?