I respectfully disagree with you Vesio. Any guide Avengers have lots of problems (Mana, Attack Speed). Zeal solves both of these problems. And while it might technically be another build. I think any conversation about Avengers should examine this "Elemental Zealot" and compare the Avenger to the Elemental ZEalot. In effect, if the Avenger can't do more damage over time than the Elemental Zealot, and the Elemental Zealot is easier on mana and the Elemental Zealot is easier on skill points allowing you to either create a secondary attack or beef up your defenses.
The best thing about Avengers is not Vengenance... Its the fact that they use the Conviction Aura. The Elemental Zealot uses the conviction aura, but probably a lot more efficiently.
Avengers really are not an elite build like Meteororb, Blizzard, Windy, Trapassin, Hammerdin, Zealot, etc. Because they don't have the raw killing power and because even a lot of pure physical damage zealots do the Elemental Zealot thing on weapon switch with the Conviction Aura. Unless you have an Avenger build that can rival this, I wouldn't shut down people talking about Elemental Zealots.
Ash2Ash, I know there was a guide for Elemental Zealots in 1.09, it was obviously a lot different since no synergies existed back then, but I think a new guide on the subject would be welcomed. Be sure to make a good descrioption of how and when you use Vengenance in the guide. Because, I'm not sure you will be doing more damage to a single target with Vengance. Good Luck and I'll be looking forward to your guide.