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While it's useless for a Summoner, I could see a Favored Class bonus that gives extra fire damage when using fire spells or alchemical fire (+1 / 2 levels or so). The little blighters are pretty fond of setting stuff on fire, after all...
Perhaps a 'let's you and him fight' Goblin Favored Class ability based around the idea of the Goblin hiding behind his summons, companion / eidolon could give a favored class bonus in hit points to either his Eidolon (if a Summoner), Companion (if a Druid or Ranger) or summoned critter (if a Cleric, Sorcerer or Wizard using Summon Monster). Only one creature can benefit from these bonus hit points (so that a Druid can't apply it to a Companion *and* one or more creatures summoned via spells).
The Goblin Summoner, at 2nd level, would add his +2 hit point bonus to his Eidolon (but not to himself!). If it dies, he can re-assign them to something he Summons (but only one creature summoned, by spell, class ability or SLA, can benefit from these bonus hit points, and all hit points gained in this way must be assigned to a single creature).