Task / Subtask Manager... - Any Suggestions???

This is somewhat unrelated to TLB, but everyone here is always so helpful and typically has good suggestions... Anyway, I'm looking for a simple (attractive if possible) task manager that allows me to add and check off subtasks. Thats it. I really like Lexa, but it doesn't allow subtasks... I haven't been able to find anything... If you have any ideas, let me know...

(I like the TLB TaskList as well, but I have the same problem... No subtasks under a larger project/task)...

Thanks!