The Apps Brancher is currently hosted at http://appbot.holba.ch/ and downloads apps from myApps and pushes them as branches to Launchpad. The list of branches is available at https://code.launchpad.net/ubuntu-app-reviews
Using apps branches
It's quite easy to review and improve any given app by just running:
bzr branch lp:~ubuntu-app-review-contributors/ubuntu-app-reviews/<appname>
Once you have reviewed and improved the app according to AppReviewBoard/Review/Guidelines you can simply push your branch to lp:~<yourname>/ubuntu-app-reviews/<appname> and put it up for discussion/vote.
It might be a good idea to use the branch status Launchpad provides to indicate in which state the app is.
Experimental - Still under active development, and not suitable for merging into release branches.
Development - Shaping up nicely, but incomplete or untested, and not yet ready for merging or production use.
Mature - Completely addresses the issues it is supposed to, tested, and stable enough for merging into other branches.