There was a short thread on the Boy Scout pattern some time ago (Traditional Knife of the Week).
The typical four bladed folder with main spear blade, screwdriver/cap-lifter, can-opener, reamer and shackle is very old, many were officially made por the Boy Scouts of America, the pattern is still very common, the SAKs (Soldier, Victorinox Spartan and a similar Wenger) The US millitary Demo, models by Case and Ka-bar and surely others.
There are also variations with three blades, with a liner lock, with six blades (reamer and corkscrew coming out of the back)
The current maker for BSA is Camillus, who also makes the Demo.
In the good old days, Cattaraugus, Imperial, Keen Kutter, Ulster and others.
It´s hard to say which is best, but I like the SAK soldier (or the Vic Farmer which adds a saw), and I used to have a six bladed Boker that was very good and very nice.
You can see some nice old BSA knives here:
http://www.scoutersattic.com/knifes.htm