It's possible that I may make a more advanced journaling system here at ATP but it won't be too similar to the DG journal app.
I think most people used their journals to simply keep track of what plants they are growing, and where on their property are those plants. Some would have a journal for "Veggie garden, 2011" for example.
What I'm thinking of doing is creating a more simple "Plant inventory" system where you can log all the plants that you're growing and you can specify which area of your place they are growing in and things like that. But it wouldn't include all the complexity of milestones, statuses and all that...
This is a project that I have been planning to do this fall after bringing it up for discussion with the membership here.