off the top of my head:

Embrace:
/pac "Embrace" <t>
--works for both Eos and Selene.

Virus:
/ac "Virus" <f>
/ac "Virus" <tt>
--good for quick virus cast without having to retarget individually (Twinny AP, for example)

Bio/Bio2/Miasma/Bane/Ruin/Ruin II
/ac "[Insert one of above]" <t>
/ac "[insert one of above]" <tt>
/pac "Embrace" <t>
/pac "Embrace" <2>
--use this for DPSing as SCH. nice to have in 4 man dungeons. just be sure to have your tank in pos 2

Cure 3
/ac "Cure III" <me>
--I have found it's much easier and faster for me to position myself for C3 in between Titan, Ifrit, etc. (the times I actually WHM) than it is to pick a pt member.