Debian APT Pinning properly explained
Posted on August 26, 2011
Accidentally stumbled across the "Debian Cheat Sheet" at http://carlo17.home.xs4all.nl/howto/debian.html
Finally some documentation on why the heck pinning with "Package: *" and "Package: mypackage" doesn't mix well, and other useful knowledge.
In case the link goes dead, here's a PDF: debian_cheat_sheet.pdf