I'm not sure what the old one did, but the 3.5 version is full caster progression, good will save, poor BAB, with the following class abilities:
1st: levels stack for familiar, and instead of summoning celestial or fiendish critters you summon pseudonatural ones. They have true strike 1/day, acid and electricity resistance, DR of n/magic, SR 10 + HD, and can be in a grotesque form that gives enemies -1 morale penalty to atack rolls. You cannot summon non-pseudonatural creatures.
2nd: +1 insight to all savess, but -2 wisdom
3rd: bonus metamagic feat
4th: +3 hit points, -4 bluff, diplomacy, and handle animal
5th: familiar gains the pseudonatural template
6th: +1 spell slot usable for summoning at your highest spell level. This migrates upward when you gain new spell levels
7th: bonus metamagic feat
8th: +3 more hit points, and another -6 to bluff, diplomacy, and handle animal
9th: immune to aging
10th: DR 10/magic, acid and electricity resistance 10, outsider type, a minor physical change that causes -4 to disguise checks