Incarnum is fucking awesome. You basically wake up each morning, give yourself a bunch of buffs (Up to 2 at level 1, 4 at level 5, 6 at level 10, etc) and then these buffs are glowy awesome. Stuff part of your soul into the buff to make it stronger- into your Crystal Helm if you need AC, or into your Airstep Sandals if you need to fly, or into your Mage's Spectacles if you want to UMD. You don't have all of the essentia in the world, so you can't have them all maxed out (at first)...
but hey, you say, your GM is a dick and he isn't giving you any magic items? Well, say 'fuck him' and grab some CHAKRA BINDS. Your crystal helm soulmeld, that just looks all floaty and glowy? Fuck it, Bind that shit to your Crown Chakra and you gain a third special ability from it- The ability to... Have the force descriptor on melee attacks. Yeah, that's less useful, but Airstep Sandals let you fly infinitely and hover in place when bound to your feet, Mage's Spectacles grant a constant Read Magic effect while bound to your brow, etc.
I've got no clue what Shaman King is, but the Totemist is basically a melee combat/Barbarian version of the Incarnate. (While the Soulborn doesn't exist. No, seriously, that section is so shit just block it from your memory.)
ANYWAY. Totemist has a different list of soulmelds, all themed after various monsters or abilities. Lamia Belt gets you Bluff and Hide bonuses, Manticore Belt gets you Jump and Spot, etc.
But the Totemist has a new, special chakra- the TOTEM CHAKRA. It's bigger, it's badder, almost every single totemist soulmeld has a special totem chakra that gives them natural attacks. Manticore Belt lets you shoot a volley of spikes, Girallon Arms gives you four claw attacks, etc. It's awesome. (And you want to get the 'two chakra binds to same slot feat as MUCH AS YOU CAN, for the totem chakra)