i found BM the best way to go while leveling so your on a good roll, for the addon part there is an addon wich lets you put food in it and then you only need to click it when your pet gets hungry, can't remember the name at the moment.
to be honest, i don't have many hunter specific mods, i'm using a reagent/ammo tracking fubar addon coz i have a lock/hunter/druid/mage/rogue so its for multi-class. And thats about it to be honest.
i've downloaded that trapbar addon from davies and its cool, but haven't really played with my chars the last few weeks since i'm kind of modifying the Wrath Enhanced UI
and i'm trying to get that one compatible with wrath as well (almost done).
What i would advise is an aggro meter so you can see how much room there still is to deal dmg before you get aggro instead of your pet.
And maybe Venantes is a nice idea as well, that one is a sphere addon wich basically combines your hunter skills for traps/beast mastery/etc all in one addon so you can save a bit of room on your action bar
Greetz,
CM