We generally use variants of 4d6 drop lowest - that's what I did for both Freeport and ToDW.
For the Planescape game, five of the characters were 'converted' from a MUSH that used the method of 4d6, drop lowest, if you don't like it you can completely reroll up to two times, but no going back to a previous roll.
Even though most of us wound up taking our first roll, the stats are pretty insane (this is after 3 level bumps, but without equipment):
Cleric: Str 10, Dex 16, Con 14, Int 18, Wis 18, Cha 14
Sorcerer: Str 8, Dex 13, Con 13, Int 18, Wis 12, Cha 20
Ftr/Rog: Str 14, Dex 18, Con 14, Int 14, Wis 12, Cha 13
Monk: Str 16, Dex 18, Con 12, Int 14, Wis 18, Cha 10
Paladin: Str 16, Dex 9, Con 12, Int 12, Wis 14, Cha 19
I often wonder if the dice code on that MUSH was a little wacky.
J