Be evil.
Play a Pixie.
-4 Str, +8 Dex, +4 Wis, +6 Charisma, +6 Int. 60 foot fly speed (good), Greater Invis on 24/7 (You can Suppress it), more 1/day spell like abilities then you can shake a stick at, small size, +1 natural armor, low light vision (Who cares, See the Unseen rocks), SR 15 + class level, 10/Cold Iron, +2 racial to listen, spot, search checks. Dodge as a bonus feat.
Sure you do crappy damage, but a Warlock isn't meant to be a true glass cannon anyway. Pick up some of the nifty Battlefeild control invocations, and you'll be a true terror against anyone who doesn't have See invis. And even then, you can just blind them (If you bother keeping Beshadowed Blast, but meh).
Yes, the +4 LA is steep as all hell, but damn you get a crap load of stuff for your sacrifice.
And if damage is really important to you, PrC into Hellfire Warlock at 10th level, (3 level PrC with +2d6 damage to EB per level, though you take a point of con damage each time you use the Hellfire Blast.) Grab something like Fly By Attack, and Quicken Spell Like Ability. Pop an Hellfire Blast once, twice if you want, in a single round then if your con starts dipping to low, pause and use rods of lesser restoration.
Or if you don't care for losing another warlock level, Multi-class into Binder for one level, pick up the Naberius bind, and now you'll be healing 1 ability damage per round.
Huzzah.
Also, here's a link that has a great deal of warlock information. From races to prestige classes to invocations and magic items.
Thinblade's Warlock Handbook