Onyxia strategies...

[Leshy]

Our main tank (and I _think_ sometimes also our backup tank) then engage her and drag her back into position, with nobody else attacking at all until some aggro has been built.
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Also, make sure that everyone has CT_RaidAssist and the option "Show Main Tank's Target" on. Anyone who gets aggro from Onyxia during Phase 3 should immediately drop whatever they are doing and move to the North wall, which makes it a lot easier for the MT to regain aggro.

As for the fears, they are going to be a huge pain in the butt when 1.7 hits. Up until now I've been able to avoid them almost completely by moving backwards once the ground starts shaking, which prevents the fear effect from having you run around. A very useful item to have will be the Blacksmith's Insignia trinket, which grants +10 to all resistances, 50 armour, and Fear immunity for 30 seconds. I personally always use it for the Phase 2 -> Phase 3 transition to get back into position without having to worry about the first two fears or so.

We've also noticed that Onyxia seems a lot more prone to spam Fear and switch aggro during Phase 3 when DPS on her is low, so our current strategy is to keep damage steady on her once the tank has her under control, and only take very sparse breaks.