irdeggman said:An Eldritch Blast is specifically "a ray".
Complete Arcane pg 7:
“An eldritch blast is a ray with a range of 60 ft. It is a ranged touch attack that affects a single target, allowing no saving throw.. . . .An eldritch blast deals half damage to objects.”
A warlock can take Weapon Focus (ray) for his EB.
It is considered a weapon-like spell (CA pg 71)
A warlock can take Weapon Focus (Ranged Spells) (as can any spell caster and applying it to rays. (CA pg 73).
Precise Shot and Point Blank shot are also feats that can be applied to rays (and eldritch Blast).
Just because an eldritch blast can do damage against objects does not mean that it can be used to target attended objects. Since there are special rules for it, you have to fall within those rules. Rays are consider ranged weapons and by the rules for targeting attended items ranged weapons cannot target a foes items. If you take the feat Ranged Sunder then you can target items that your foe is holding with ranged weapons. Since a ray is a ranged weapon, it would be included in this feat.