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George controls 2 Acidic Slimes, one enchanted with Reflexes.  He casts overrun and attacks Sylvia.
Sylvia controls a Palace Guard enchanted with Indestructibility.  Sylvia declares the Palace Guard to block both creatures.

In summary we have two creatures attacking:
5/5 Deathtouch, first strike, trample
5/5 Deathtouch Trample

Both being blocked by
1/4 Indestructible

What is the maximum damage that can be dealt to Sylvia from this attack?

There is debate between 9 or 8 damage.
People who argue 9 say when the non first striking creatures deals its damage, it already takes into account that lethal damage has been assigned to the creature so the full 5 comes through.

People who argue 8 say the damage is dealt in the previous step, but after states are checked and the attempt at destruction occurs, the damage does not remember it was from a source, so the second attacker still has to assign the 1 damage to the blocker.

Yeah it's 9, whether or not one of them has first strike.

In this case, the 1 damage is still on the indestructible creature, it hasn't gone away after the first combat damage step. So it's still considered having 'lethal damage' so the trampler can ignore it in the second step.

It seems to me that what rudolf quoted only addresses cases where multiple creatures are dealing damage simultaneously, though.

I've just done a search through the comprules for the phrase "lethal damage", and there's nothing that makes it clear whether a creature with damage from a source with deathtouch is still considered lethally damaged after the next SBE check (though 702.2b might appear to imply that it is), in the way a creature with damage >= toughness is.

Jul 24, 2010 -- 11:29AM, TranscientMaster wrote:

Eight.

The first-striking 5/5 deathtouch trampler has to assignl lethal damage, either damage equal to toughness (4) or one deathtouch. Naturally, you choose to assign one to the Guard and trample four.

Then, the normal-striker has to deal damage equal to toughness minus marked damage (three), or one deathtouch. The creature does NOT have lethal damage marked on it (Deathtouch damage is only lethal during damage assignment, not once it's been dealt and is sitting on a creature. Even assigning damage during the second phase, the death-touchness of the damage goes away after SBA's are checked and the Deathtouch one has tried and failed to destroy it), so you have to deal your single token damage to it before trampling through.

This rule doesn't say it's not considered lethal damage after the first combat damage step.  It just says that any non-zero combat damage is considered to be lethal damage. 

702.2b Any nonzero amount of combat damage assigned to a creature by a source with deathtouch is considered to be lethal damage, regardless of that creature’s toughness. 

There's another rule that says the creature won't be destroyed, but that doesn't seem to negate that the creature has lethal damage on it and so the creature with trample doesn't need to assign it any more damage.

Yeah I was just about to post the exact same rule and say the same thing!

The SBA says this:

704.5h If a creature has toughness greater than 0, and it’s been dealt damage by a source with deathtouch since the last time state-based actions were checked, that creature is destroyed. Regeneration can replace this event.

So if the creature later that turn stopped being indestructible, the damage wouldn't destroy it. That sort of, but not conclusively, implies that the damage stops being lethal damage... but the rule rudolf quoted doesn't say it stops being lethal damage after a certain point. The whole 'lethal damage' thing is always a bit fiddly.