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[QUOTE=olataro]OK, in short, if i have an indestructable crature to block a creature with trample, and his atk outweights my toughness, am to receive the remaining damage?[/QUOTE]

Yes.

The trampler only has to assign damage to the creatures blocking it equal their toughness minus any damage already on them. If it can do so and has more more to assign, it can assign it to the defending player.

This means that a trampler can "trample over" creatures that are indestructible or undamageable (like Dawn Elemental or Progenitus) if it has a high enough power.

702.17. Trample

702.17a Trample is a static ability that modifies the rules for assigning an attacking creature’s combat damage. The ability has no effect when a creature with trample is blocking or is dealing noncombat damage. (See rule 510, “Combat Damage Step.”)

702.17b The controller of an attacking creature with trample first assigns damage to the creature(s) blocking it. Once all those blocking creatures are assigned lethal damage, any remaining damage is assigned as its controller chooses among those blocking creatures and the player or planeswalker the creature is attacking. When checking for assigned lethal damage, take into account damage already marked on the creature and damage from other creatures that’s being assigned during the same combat damage step, but not any abilities or effects that might change the amount of damage that’s actually dealt. The attacking creature’s controller need not assign lethal damage to all those blocking creatures but in that case can’t assign any damage to the player or planeswalker it’s attacking.
Example: A 2/2 creature with an ability that enables it to block multiple attackers blocks two attackers: a 1/1 with no abilities a 3/3 with trample. The active player could assign 1 damage from the first attacker and 1 damage from the second to the blocking creature, and 2 damage to the defending player from the creature with trample.
Example: A 6/6 green creature with trample is blocked by a 2/2 creature with protection from green. The attacking creature’s controller must assign at least 2 damage to the blocker, even though that damage will be prevented by the blocker’s protection ability. The attacking creature’s controller can divide the rest of the damage as he or she chooses between the blocking creature and the defending player.

702.17c If an attacking creature with trample is blocked, but there are no creatures blocking it when damage is assigned, all its damage is assigned to the player or planeswalker it’s attacking.

702.17d If a creature with trample is attacking a planeswalker, none of its combat damage can be assigned to the defending player, even if that planeswalker has been removed from combat or the damage the attacking creature could assign is greater than the planeswalker’s loyalty.

702.17e Multiple instances of trample on the same creature are redundant.