Particle_Man
Explorer
WotC's own examples for feats for Warlocks include such things as Maximum Spell-Like Ability (Eldritch Blast) and Quicken Spell-Like Ability (Eldritch Blast). Page 214, Players Handbook II. Btw, they also have Ability Focus (Eldritch Blast).
Also, Complete Arcane pp. 71-2 says "Warlocks and other creatures with spell-like abilities might find the following feats useful . . . Creatures with Spell-Like abilities at a high enough level will find sudden metamagic feats less useful than the dedicated feats Empower Spell-Like Ability and Quicken Spell-Like Ability (see page 303 of the Monster Manual), as well as the Maximize Spell-Like Ability feat introduced in this chapter." under the section "Invocations and Spell-Like Abilities".
Complete Mage has examples of Warlocks with the feat Maximize Spell-Like Ability (Eldritch Blast) for two of the three "warlock prestige class" characters in that book (p. 57, p. 60).
So it is clear that Spell-Like ability feats can be and are used for Eldritch Blast. Pergentile is incorrect to say that "It is specifically stated that metamagic feats (even ones for SLA's) can't improve a warlock's eldritch blast, the only exception being the sudden metamagic feats."
Also, Complete Arcane pp. 71-2 says "Warlocks and other creatures with spell-like abilities might find the following feats useful . . . Creatures with Spell-Like abilities at a high enough level will find sudden metamagic feats less useful than the dedicated feats Empower Spell-Like Ability and Quicken Spell-Like Ability (see page 303 of the Monster Manual), as well as the Maximize Spell-Like Ability feat introduced in this chapter." under the section "Invocations and Spell-Like Abilities".
Complete Mage has examples of Warlocks with the feat Maximize Spell-Like Ability (Eldritch Blast) for two of the three "warlock prestige class" characters in that book (p. 57, p. 60).
So it is clear that Spell-Like ability feats can be and are used for Eldritch Blast. Pergentile is incorrect to say that "It is specifically stated that metamagic feats (even ones for SLA's) can't improve a warlock's eldritch blast, the only exception being the sudden metamagic feats."