Looking for a todo webapp or service

Today I decided to start writing up the things that I have to do, for Gentoo, work, life, and so on. Since a To Do list is not exactly simple to maintain since I have dependencies between tasks, I decided to try writing it down as a FreeMind mind map. The result isn’t perfect but it works somewhat.

But then I started to think that most of these tasks are Free-Software related, and might as well go public, so that others can look at them and help on them, maybe. Which brings me to the current point of not knowing how to evolve this. An obvious overkill would be to use a private Bugzilla instance, but I’d rather not run another one on the vserver, and it certainly looks ugly.

What I’d need is something that looks like the mindmap but is editable via web by an user, and where the tasks can be set public or private, with dependencies between tasks, ability to add comments and resources to the tasks, like files (patches), prioritising, adding keywords and similar.

Does anybody know anything like this? I’m happy to pay for a subscription if the service is not free, but is good enough (it would ave me time, and time is money, so I’d probably be saving afterward).

Edit: I skimmed through some things I read some times ago and found Remember The Milk which seems to do almost all what I need beside attaching files and having dependencies for tasks. Does anybody use a pro version of it and can tell me whether the support is good for feature requests too? If they would consider adding those two features in a shortish timeframe I might actually decide to subscribe to that, if nobody else suggests me something better.