MendoMount

This addon will randomly select a mount for you to ride from your entire pool of mounts, based on the zone you are in (including AQ40) and your riding skill.

The easiest way to use it is to create a macro that simply says "/mm". This will call the addon's mounting function, which will then dismount you if you are already mounted (like clicking on a normal mount's icon would) or it will randomly summon one of your mounts.

I have a few updates that I need to do to it still. I'd like to add in some more slash commands, to allow the user to choose what type of mount he'd like to summon. It also doesn't currently summon any versatile mounts (ones that will change depending on your skill). I'll probably change this in the next couple days.