Arch's news feed (http://www.archlinux.org/feeds/news/) is worth adding to your RSS reader. Firefox's Live Bookmarks keeps it close by, for me.

Any possible breakage that updates may bring can usually be found in their news posts as well as what you can do to fix it.

Probably won't cover everything, but that coupled with the .pacnew settings for config file changes has kept my system from breaking.