For a good synergy of classes Druid//Totemist on the Vow of Poverty. I'm currently playing one at level 7, it's really fun. Especially when the DM thinks I'm done with my attacks, and then I add in four more because of Girallon Arms...During a Charge.

Looking at things now though, I don't think I would really have taken Vow of Poverty in the long run. 1) Keeps me from Chaos Shuffling 2)Distribution of Wealth wise I have to donate all that money off which I could be using to up my AC or Attack/Damage Bonuses. 3)For what bonuses you get, they just don't seem to scale well enough for what I would like. It might just be the campaign the DM's running, but we have some strong demons and undead we've been encountering as of late.