OK, that makes sense, certainly do stupid thing still equals make pretty red spot on walls and/or ceiling for the next group through to find*. But for some reason I'm not seeing nearly as many
purely random low-level deaths in 3.5 as was the case in AD&D (like, um,
1 vs. far too many to count...

). I wonder if that's down to better-equipped (and significantly less, y'know, pre-teen-ish) players, me maturing as a DM over the last 20 years, or the CR system smoothing out the "random batch of trolls vs. 1st level party" thing... (I'm betting it's a bit of each).
*If the dungeon you're in is at all known (ie: you found it to get inside in the first place, and there's no adventurer-stains, that's a good sign there's a gelatinous cube about...

)
EDITED TO ADD: I would have thought that the introduction of critical hits would have made up for the lack of the AD&D wandering monster tables, but so far it has not in my games...