I suggest stopping by the Strategies forum, but here's a quick run down.

Heroic Blackrock Caverns- Worst case Scenario: First boss get 70 JPs + some loot.
HBRC - First Boss - Easy
HBRC - Second Boss - Medium to Hard (once you get the beams down easy)
HBRC - Third - Hard (can skip)
HBRC - Fourth - Extremely Hard to 5 box (skip it)
HBRC - Fifth - Easy to Medium (once you understand the fight mechanics VERY EASY).

Heroic Shadow Fang Keep
HSFK - First Boss - Easy to Medium (Don't top off your group till just before Darkangel, Dispell, Interrupt)
HSFK - Second Boss - Easy - Kill the Adds
HSFK - Third Boss - Medium - Kill the Adds, Or to make him Easy pull to Courtyard... Can Skip
HSFK - Fourth Boss - Easy to Medium (Very easy when you get the fight down)... Strafe back and forth during Green Light Phase... DONT MOVE During Red Light... Dodge the Frost Shit.
HSFK - Fifth Boss - VERY EASY... Dodge the Pistol Barrage, Dispell the Debuff/Interrupt

Heroic Vortex Pinnacle - 1 Quick Boss + $$
HVP - First boss - Easy (Healer Intensive unless you have 4 shamans).
Bonus: Lots of Volatile Air for Professions / AHing.

Heroic DeadMines - 2 Quick Bosses
HDM - First Boss - Easy (just dodge the aoe beam).
HDM - Second Boss - Easy to Medium ( I think he's easy just lots of movement)
HDM - Third Boss - Haven't spent the time for a good strat... I just do the first 2 for the 140 JPs and loot.

Heroic Grim Batol - 1 Quick Boss
HGB - First Boss - Easy just kill the purple adds dodge the blitz/ground siege.
HGB - Second Boss - Pretty hard that shield hurts - Skip.


TLDR; Farm BRC and SFK for JPs and Chaos orbs. Snipe the other bosses if you need JPs.

This is a decent list I'll update the Dungeon & Raid strats as I do more. There are a couple that I haven't done that I'm sure can be 5boxed all the way through or atleast a few more boss snipes till you are geared.