I saw this topic brought up in a thread about 2 years ago, but it died. No real reason I could see as to why we don't have familiars in DDO. This is a basic concept in PnP that somehow isn't an option in DDO. Sure, you can summon monsters, but it isn't the same as having a familiar.
Is there some reason why familiars are left out? Overpowered? Too hard to implement? Nobody wants them? I know there are lots of things we would like to see first, but it seems strange that familiars were totally left out of the game.