Here is some stuff from my extended signature:
Invocations:
Split Blast: Trade power for multi-targeting with this blast shape invocation... most useful in combination with eldritch essence invocations that produce an effect in addition to the initial damage. Also includes a rather interesting NPC who uses this blast shape to aid him in his work as a rat-catcher.
Enhance Familiar and Imbue Familiar with Invocation Equivalents to Familiar buffs (and one utility that is very much like a defensive buff) for members of Invocation using classes who have familiars. Made to synergize with my Coward's-Strike Warlock.*
And for clarify, the PrC
Coward's-Strike Warlock: Warlock specific version of my Artillery Mage. Same deal: Invisible familiar sees them, you shoot them without coming out from behind cover.
*Note that the Enhance Familiar thing rolls three spells into one, which is fair to me, since you have to spend a feat to get a familiar as a warlock anyway, and warlocks get very few invocations compared to how many spells even a sorcerer gets.