This has always seemed like a bit of nonsensical anal retentiveness to me. To be REALY nit-picky, the only folks who get realy upset about it are usually the ones who are actually wrong.
Clips were first successfully marketed by Count Ferdinand von Mannlicher and consisted of spring-steel metal clips that held a set number of shells. The cartridge was plugged into a hole in the stock of the weapon one way or another, usually through an open action, and a spring loaded arm held pressure on the rounds after the first was stripped off by the bolt going forward, thus supplying a fresh round after each working of the bolt. When empty the clip was discharged either through the top of the action as in a Garand, or through a slit in the floor plate like in Berthier-Mannlicher or Comission Model 1888 rifles.
Eventually the clip itself was reduced to two different things. The first being machined lips into the action of the rifle, and the feeder arm became a follower plate. Thus no longer removable this setup became called a magazine after a FIXED position on a fort or a ship where shells or ball and powder were stored.
The second device was still a clip that contained the rounds before insertion into the weapon, however instead of relying upon a seperate feeder arm found in the weapon itself, it contained its own pressure-maintaining device. Usually a coil spring, however others have been used.
The devide most folks call a clip today isnt a clip at all, it is a charger. Unlike a clip, its sole purpose in the vast majority of weapons it was used in was to top off, or refil the internal, fixed magazine. In a few weapons like the M14 and the VZ58, it was to top off a clip inserted in the weapon. While a nice idea, obviously a redundant one. Like a transmission on a car that can operate in both manual and automatic mode. Fun and useful in theory, but somewhat usless in practice.
While its true today the terminology has changed a little, ultimatly, historically, a clip is a block of rounds, weather self-contained or not, designed to feed the action of a weapon until empty, and then be changed out for a fresh "clip" of ammunition. (For refrence the first self-contained clip was employed on the M.1891 Mausers to escape pattent (sp?) infringement on Mannlicher's clip employed on M.88 Steyr straight-pull rifles)
A charger is a block of rounds ment to charge a fixed magazine and then be discarded before the weapon is employed.
A magazine is a fixed part of a weapon generally found in hunting rifles, shotguns, and obsolete battle-rifles.
I can back my facts up, so before you tell me I'm wrong..... :)