I haven't done most of them....
I'm almost done with Arborea, and that's all so far. Here are a few guidelines that I'm using:
~8 of the planes get the SMI-IX lines, the ones with only one associated alignment.
~Each plane gets one or two more tracks of spells, usually taken from cleric or druid spells, especially domain spells that make sense.
~Each plane gets one or two thematic tracks, like the abyssal weaponry based on the Balor's long sword (I figured the 9 hells would get natural attacks like a Pit Fiend or something) or the celestial mount that Arborea is about to have.
~Each track's downside should be something noticeable but not at all crippling, and thematically related. So far I've tried to keep every penalty different, but it probably won't end up that way because there's a limited amount of penalties one could apply.
Does that help? I'll post Arborea tonight or tomorrow morning.