This is my style:
PCs die when they make stupid mistakes, and the DM sometimes pulls punches when they do something smart but the dice don't roll their way.
Caveats being...
1.) It is very, very rare that I do this.
2.) The players never know when I pull this shiznit...they would string me up if they knew.
3.) My campaign does not support the curse and soul sucking stupidity that is easy resurrection.
I am really surprised that there are DMs out there that don't allow PCs to die and that there are players who actually expect to have every encounter balanced for them as if the world is set to some videogamey difficulty level (easy, medium, hard, nightmare) that somehow balances itself against them no matter where they go.
What is the point of a game filled with combat, eldritch horrors, dragons, demons and whatnot if there is no fear of death on the part of the heroes? Heroism in either a high fantasy or sword and sorcery millieu requires the very real possibility of death. There can be no heroic last stands if there is no death. There can be no sense of the real repercussions of evil and/or war without death. Without the possibility of death, D&D is IMO a kids game of guaranteed victories and shallow heroics. Somewhere along the line, some people confused D&D with a videogame where as long as you have a saved game everything will be fine.
Maybe if I were playing with a bunch of kids (9-14yr olds) I would be very lenient. I'm not trying to break a little kid's heart. If I am playing with adults (18-30+) they will either accept that death can happen or they can go play shoots and ladders with the kiddies. Having said that I am not against all resurrection, it is available, but there is a very high cost in resources and/or effort to get it.
Sundragon