In a game I ran, I used the 4d6 method, but after I had one player get *astonishing* rolls, I've decided to go point buy. Latest game I'm in uses 35 point buy.
In one game we just distributed 75 points among all stats, on a one for one basis. In another, more high-powered camopaign we just let the players choose the stats, with the total sum of the modifiers capped at +13 (they total ranges from 10 to 13 in the current party).
Same situation as CG above, had used standard 4d6 until two players used electronic dice rollers to make thousands of sets of six rolls to end up with multiple 18's and nothing below 12; it's now point buy all the way.
used to be 4d6 drop lowest, any order..
but this campaign it's 15, 14, 13, 12, 10, 8. While it's hard, I wouldn't really have it any other way. Combat feels good and challenging yet appropriate. If anything the campaign is pretty much set on "Hard" this way and it's good.
Anyway, if you roll up millions of people, this is what you get for points (one for one).
1 in a million - 96 point assign
1 in 100,000 - 92 point assign
1 in 10,000 - 88 point assign
1 in 1,000 - 84 point assign
1 in 100 - 80 point assign
1 in 10 - 76 point assign
roughly, anyway. Quite a lot of 70+ point buy characters if you roll them all.
Stat array, varies by campaign, but usually (11, 12, 13, 14, 15, 16). That way only races with stat bonuses can start out with 18's, which makes certain gravy feats harder to acquire. It works out to a 36 point buy, but with less min-maxing.