The other day I was trying to do a search for something, but kept getting hits in Bibles, although I wasn't necessarily trying to search my Bibles (let alone multiple translations). As a result, I came up with this rule for a collection that will allow you to search everything in your library, minus your Bibles.
rating:<=5 ANDNOT type:bible
The rating tag of equal to 5 or less allows it to grab every book in your library (only way I could come up with to grab everything) and then excluded the Bible type.
This is great for searching your library without Bibles getting in the way. I find it useful, and thought others might also
I've already added it to the wiki. 
