We covered another Ackis mod, Ackis Recipe List, just last Sunday. This one is (in my opinion) even cooler, and will be of interest to a wider audience than recipe completists. I Have Macro Lol!, or IHML for short, generates a dynamic macro (like Mounted) for you to use in various situations, like dailies and boss fights. You can use just one slot on your action bar, and the macro will adapt itself to whatever situation you happen to be in.
From the configuration interface (/ihml), you can set up what macro you want to use in any given boss encounter or zone. The macro is generated upon entering a zone or loading BigWigs boss modules for a boss fight (no support for Deadly Boss Mods, as far as I know). You can also set up default macros for parties, raids, PvP, etc.
The real value here is dailies. There are several different daily zones in Wrath, all of which have different items that need to be used. Back in BC, I could get by with just my Isle of Quel'Danas macro; nowadays, if I was still bothering with dailies, I would need about six different macros to swap out if it wasn't for something like IHML. The boss functionality is just icing. Thanks again, Ackis, for another solid mod to fill a gap.