I know that there are a few people out there that really despise skill trees [looks at Youngblood], but never-the-less, many of my favorite games have them in there and Diablo 3 is no exception to that list. For some types of games, they just make sense if they're done right.I felt that the skill trees were adequate in Diablo 2, but they did favor a cookie cutter build for each class. That was even more true after the introduction of skill synergies in the Lord of Destruction expansion, though in some cases there was a shift in the balance of power to a different cookie cutter for your particular class.
Blizzard has stated that in D3, they hope to either streamline or completely remove the synergies in the skill trees. They want to make sure that the builds that are chosen are done out of personal preference and not due to them being the cookie cutter for the class. All the while keeping them balanced in both PvM and PvP game play(although I'm not so sure that's even possible... look at the balancing act done with the WoW class trees on a continual basis).
Whatever they come up with, I'm excited to see what knowledge they've gained from their past victories and failures, and how they plan to implement that knowledge in to the next volume in the Diablo series. So far, it appears that the Skill Tree UI (seen below) looks strikingly similar to that of the Talent Tree UI in World of Warcraft.

Each class will have three branches of skills to choose from that will allow varying levels of specialization in a player's character build and therefore group role. Each branch will be comprised of (currently) six tiers of skills to choose from. As with Diablo 2, it appears that each skill will max out at 5 skill points and of course, there are level and skill prerequisites to purchasing some skills further down the tree. Fortunately, the branches don't pigeonhole the player in to a specific role without providing a means of solo success (like the Holy build of a WoW Priest arguably does). Hopefully that will allow players to choose their builds based on their personal play style preference and not out of necessity.
The Barbarian
The Barbarian tree will consist of the Berserker, Juggernaut and Battlemaster branches. The Berserker branch skills appear to focus on more single target skills such as Battle Rage, Frenzy and one of my personal favorites, Whirlwind. The Juggernaut branch has more multi-target attacks built in to it's skills including Cleave, Seismic Slam and Earthquake. The Battlemaster branch approaches the class from a different point of view and offers up a host of buffing skills like Battle Cry, Enrage and Ignore Pain. It's also worth mentioning that the Battlemaster tree houses the skill Hammer of the Ancients, which is capable of some seriously massive damage.You can check out the full list of Barbarian skills on the DIII.net site.
The Witch Doctor
While we don't know as much about the Witch Doctor as we do the Barbarian, we still have a decent amount of skill information about the class. The three branches of the Witch Doctor skill tree are Plague; which, as the name would suggest, is fleshed out with skills that are reminiscent of the D2 Necromancer's abilities. Those skills include Plague of Toads, Locust Swarm and Carrion Spiders (taking the place of Spider Statue). The second branch is Spirit and includes skills that seem to come from a darker place. Skull of Flame, Soul Harvest and Firebats are included in the tiers of this branch. And last, but surely not least is the Voodoo branch, the home of the infamous Wall of Zombies, and the equally gnarly Summon Mongrel and Sacrifice. What an entirely tasty group of skills to sink your teeth into.You can check out the full list of Witch Doctor skills on the DIII.net site.
The Wizard
The Wizard is another class that we have a plethora of information on regarding the skill trees with a total of 58 known skills spread across the three branches. The Conjuring branch includes cool stuff like Spectral Blade, Conjured Armor, Meteor Storm and Magic Weapon. The Arcane can attack the dark with Magic Missile, Wave of Force, Slow Time and of course, Teleport. The third branch, Storm, houses all of the weather effects such as Thunderstruck, Deep Freeze, Electrocute and Blizzard. It'll be a close second between the Wizard and the Witch Doctor to be the second class I roll.You can check out the full list of Wizard skills on the DIII.net site.
The Monk
The Monk class is new enough that we still don't know much about it. It was announced at BlizzCon 2009 and only showed off a few of it's skills. We don't even know the real names of the skill tree branches. Tree A includes Force Without Thought, Seven Sided Strike and Way of the Hundred Fists. Tree B has in it Crippling Wave and Exploding Palm. And Tree C holds Impenetrable Defense and Radiant Visage. All of which have been showcased in the gameplay trailers for the Monk and are one of the prime reasons that the Monk will be the first class that I roll on release day.You can check out the full list of Monk skills on the DIII.net site.
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