I'm sure at some time someone has requested this, but nothing I can find recently. With the CRB, APG, UM, ACG, and OA, we're now up to 27 spellcasting classes (counting the adept), 20 of which have unique spell lists. With the "everyday" spells spread out between the "Core Four", and even more spells spread out through all the adventure paths, companions, "non-core" rules additions (ARG,ACG,etc.), blog posts, and Nethys knows what else, it gets confusing, even annoying, to manage one's spells.
Can we get a compilation book? One with the spells from the "Core Four" and the other "non-core" rule books, with a decent selection of the better spells from other sources, as well as some never-before-seen goodies rescued from the editing room bin or culled from the RPG Superstar competitions? I'm sure it would quickly become one of the most often referenced books, like Ultimate Equipment, at many a game. My group uses the CRB and UE so much we always have at least 2 copies of each floating around the table, and I would be surprised if this weren't that way as well!
As a logical follow up, a Campaign Setting expansion would be quite useful as well. And I'm sure folks would love a Companion that focused on getting more out the spells they already have....