A few months ago, Julian Danjou stopped updating his bleeding-edge GNU Emacs Debian packages (http://emacs.naquadah.org/). I've been using those for a while, and I'd like to continue doing so. Thus, I'm now building and hosting my own bleeding-edge packages: http://emacs.secretsauce.net/.
There's nothing particularly noteworthy about the building or hosting of these.
/etc/apt/sources.list entries are
deb [arch=amd64] http://emacs.secretsauce.net unstable main deb-src [arch=amd64] http://emacs.secretsauce.net unstable main
In other news, it turns out that web site hosting is now incredibly cheap.