osc is tool for obs, let's say it's like (not really but «like») git tool just for obs

http://en.opensuse.org/openSUSE:OSC here is how to use it (the installations is for opensuse, but i even has it in portage on gentoo).

All you need to install it (i bet it's something like apt-get install osc for ubuntu) and than add repo (from submit wiki on meego) — osc -A https://api.pub.meego.com co home:[username]
than you just go to this home:Schturman/your_mega_app (i assume you already have app there and it would sync it to local folder)
and than copy needed files there , for example new_app-2.0.deb
than just delete old one — osc rm new_app-1.0.deb ,add new — osc add new_app-2.0.deb and commit — osc commit (it would popup terminal editor of your choise, save, press «c» to continue and it would upload new file)
you can add several files before commit as well.

☺☺☺