So it would have something like:
- Social player (calculated: 16 hours)
- create mockup (est: 4 hours)
- implementation (calculated: 12 hours)
- fix orbited on IE and firefox (est: 6 hours)
- non-owner interface (est: 3 hours)
- owner interface (est: 3 hours)
Calculated means that it's the total of all the estimates at lower levels. Ideally, you'd be able to tag todo items, too, so I could tag certain things as "required" or "nice to have" and say "how much time would it take to get all required things done in the implementation phase of the social player".
I can't find anything that fits the bill exactly. Any suggestions?