I often forget to switch my talents and glyphs for the fights that i need to do so. To assist in this matter, I made ZoneSpec. I noticed that most bosses have a single sub-zone all to themselves, so I take advantage of this to "save" a particular talent/glyph config as a reminder of what you might need to change.
It also includes a reagent tracker (i.e. Tome of the Clear Mind) that will display when you have six or less.
This is my first published addon, so please don't go easy on me.