I have Gitweb set up to track various projects I'm working on in git. You can also access my git repositories directly using the URL git://git.steven-mcdonald.id.au/$REPO_NAME.git, where you can find possible values of REPO_NAME from Gitweb.
I also have an APT repository for Debian sid, which I am using as a place to upload my Debian packaging before it is ready for Debian. Please don't ask me to support anything other than sid; my aim here is to get packages into Debian itself, not to provide yet another third-party repo.
That said, if you want to test packages I've uploaded here, add something like this to /etc/apt/sources.list:
# Steven McDonald's APT repository
deb http://ftp.steven-mcdonald.id.au/debian-packages/ unstable main
deb-src http://ftp.steven-mcdonald.id.au/debian-packages/ unstable main
This repository has its Release file signed with my OpenPGP key , so you'll probably want to tell APT to trust it. For the lazy:
$ wget -qO- http://www.steven-mcdonald.id.au/pgp_public_key.asc
| sudo apt-key add -