If you use vim with the vimoutliner plugin you can use TKDO. It's a small commandline python program to aggregate tasks from multiple outlines and display them in a GTK window or list them in the shell. It is not Hildonized but this should not be to difficult.

I have been using it for a couple of weeks and it suits me very well.

EDIT: I just saw this thread is in the newbie category. This solution might not be suitable for newbies.