If a PC dies, which doesn't happen with our group often, the player usually just shrugs and rolls a new one up again. The attrition rate for PCs in my campaigns is pretty low, since I try to avoid killing characters if I can, though sometimes they just die. When they do, I rule that if the player wants to make a new PC, I will find a way to introduce that PC ASAP - they never just 'show up'. I always allow them to start at the 'average' level of the party; the PCs are usually all the same level anyway. I NEVER allow players to take the same PC again and say it's his twin brother - that's a cop-out.
Also, just as an aside, I've never had a PC raised or ressurected. I don't actually ban the spells (usually), bnut my players don't seem to want to use them. Suits me.