You know Ranged Pin, that useless feat from Complete Warrior that allowed you to grapple at a distance, in a sucky manner?
Well, combo that with Grappling Blast, a Warlock-only feat that adds your Eldritch Blast damage to a grapple, and then adds half that damage as a bonus to your grapple check.
Hmm... Improved Manyshot, anyone? Or Rapid Shot.
Yes sirree bob, I love full attacking with my Eldritch Blast...
Sure, it requires that there be a nearby surface for you to pin them to, but if you are a Warlock with a +5 BAB, you can most likely fly already, and the ground is one hellishly nice pinning surface.
Throw in Master Thrower, and watch your opponents cry as you nail them with something like 6+ full damage Eldritch Blasts.
And there isn't anything that prevents you from throwing an Eldritch Essence on there.
One issue with this is that it requires that you are making a Grapple check to deal damage; however, there are feats for that, iirc.
Thoughts?