A couple questions re: FF
The zoning trick works for just about any click buff(or debuff if it were possible for an enemy to go though a loading screen) that uses the "doesnt stack from same caster" flag. 
There are very few exceptions to it.
Off hand, Mystic Fortune, but that's not really a buff in itself so much as it's a *grant random temp power to target*
A short list of buffs for defenders that work of the top of my head:
[Cold Domination]
The 2 shields, frostwork
[Empathy]
Fortitude, Adrenelin boost, Clear mind(the auras would work too but they aren't perma-able)
[Force Field]
The 2 Force fields
[Kinetics]
Speed Boost, Inertial Reduction, Increase Density(This is already stackable, but normally doesnt stack the smashing/energy damage resistance, with the zoning trick, it it does)
[Radiation Emission]
Accelerate Metabolism
[Sonic Resonance]
The 2 shields, Clarity
[Thermal Radiation]
The 2 shields, Thaw
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Also, if memory serves correct, as long as you don't let the bubbles expire, the Super FFs will remain on the team member. Meaning, Once you pop Power Build Up + FF your team member, every time you refresh the FF on that individual, they will be Super Bubbles.
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For clarification as it looks like some different opinions on the matter:
Zoning to stack bubbles - good
Reapply bubble on top of a powerboosted one while in same instance - bad, it overwrites it with the lower value
I highly recommend using the zoning trick on any buffs it applies to (list provided in a previous post). It is very powerful and can really smooth out the early mission fumbles that often occur.
I don't hold up the team to make it happen, but hit whoever I can and try to make sure I get double buffs on the main people drawing aggro.
Bubble outside door + PBU bubble inside door = carte blanche for squishies to go solo some cysts on the 2nd ITF mission.
Global = Hedgefund (or some derivation thereof)

The double stacking works for the cold shields and thermal shields as well.
Triumphant Defenders Forever
Psylenz FF/Psi, ArticQuark Storm/Rad, Symon BarSisyphus Bots/psn, Max VanSydow Thugs/Dk, Cyclone Symon Bots/stm, Blue Loki Ice/Cd, Widow 46526
HelinCarnate:OMG it is so terrible. I have the option to take 3 more powers but no additional slots. Boo F'ing hoo.