Very nice guide (already, and it's not even finished)! Thinblade's was indeed in need of a dust-up.

Two remarks that come a bit late as I just read through the thread:
- Arcane Mastery is also useful for Warlock who take one of the dispelling Invocations. Associate it with a cheap Dispelling Cord (MIC) and it affords you great reliability

- I also think Beshadowed Blast should be Black. I agree few people will take it because of the opportunity cost, but in itself it's not bad. In particular, it can hose arcane casters who are among of the warlock's (and the party's) worst enemies. Fort may not be the best save to target, but it's good to be able to target all saves with various effects, and blinding is great.