Hi Yue Wu,
the project is still alive, but the group hasn't been used much.
At the moment I am rewriting big parts of MobileGTD adding lots of test cases
and refactoring for easier extensibility.
I have a posted an issue for sub-projects on the Google Code site,
but that will have to wait until I finish the refactorings are done (about 1 month).
I have not planned on implementing moving actions between projects.
I create new projects for stuff and name them as comes to my mind,
just like I would when jotting on a piece of paper.
Later when I review the projects, I either trash them, tickle them, put them into Someday
or I decide to do something about them now and give them better names and add actions.
For me that works quite well.
By the way, if you know Python you can just go ahead and have a look at the code.
I will happily apply patches you send me :)
Regards
Martin