This is an excellent article about champagne and the mechanism of carbonation loss. The comparison beer/champagne comparison w/r/t pouring methods shows some ignorance of how beer should actually be poured.

It should be poured the way champagne is traditionally poured - into a non-tilted (clean) glass. Beer is meant to lose some carbonation on pouring and then one has the benefit of a fantastic "collar" of foam, or head.