Touted as - analog system for the digital age - this site will help you make lists effectively, so you can be more productive, and use your time wisely.
Bullet Journal
A List of Books
With over 600 books listed from several Top 100 Books lists, I'm wondering how many of these books have you read?
Trello
Keep yourself or your team on track with Trello's free project management services.
List Challenges
An offering of lists that with items that interest you where you mark off the things you've done: movies you've seen, books you've read, or foods you've eaten.
Shutterbean
Cool Site - Shutterbean brings you an awesome array of photography, recipes, and list of interesting things to check out!
Lazy Meter
I am a list maker. I make lists for everything - chores, hobbies, activities, bills, shopping, etc. While this usually makes me a very organized person, on occasion it has a tendency to backfire when I get a little overzealous. So to prevent myself from being overwhelmed by my summer to-do list, I went looking for sites that helped manage such lists.