Congrats on launching. I just watched a Mixergy interview with the founder of http://ranker.com. How do you differentiate yourself? They have quite a bit of traction now it seems.
Ranker employs the social ranking within lists, so the crowd decides what goes to the top of each list, while List Central does social rankings on lists compared to other lists. List Central also allows for private lists, so there can be both fun and useful lists.
Another major difference is that List Central is bootstrapped and Ranker has found Angel funding.