Among the commentary on the famous Iraqi shoe-chucking incident, this is the first one I've seen that points out the generally jocular and positive (or at least ironically negative) implications of footwear projectiles in western culture. More specifically, I haven't seen any mention in this connection of the "wedding shoe" tradition.
Here's how it used to be — "Throwing the wedding shoe", NYT 2/11/1887:
This custom of throwing one or more old shoes after the bride and groom either when they go to church to be married or when they start on their wedding journey, is so old that the memory of man stretches not back to its beginning.
Or E. Cobham Brewer, Dictionary of Phrase and Fable, 1898:
It has long been a custom in England, Scotland, and elsewhere, to throw an old shoe, or several shoes, at the bride and bridegroom when they quit the bride’s home, after the wedding breakfast, or when they go to church to get married. Some think this represents an assault and refers to the ancient notion that the bridegroom carried off the bride with force and violence. Others look upon it as a relic of the ancient law of exchange, implying that the parents of the bride give up henceforth all right of dominion to their daughter.
This seems to be connected to the idea that throwing old shoes is a way to bring good luck more generally — at least we find things like this couplet from Will Carleton's 1886 "How we fought the fire", in a list of the stuff that came out of a burning house:
Old shoes enough, if properly thrown,
To bring good luck to all creatures known;
And Robert Dixon's 1683 Canidia; or The Witches includes several references to such a superstition, e.g.
But throw an Old-shoe with a Spell,
Or nail a Horse-shoe cross the Cell,
'Twill drive away Devil or Man,
And let them hurt you if they can.
For good luck, throw after me an Old Shoe.
These days, I guess the residue of this tradition is just tying shoes to a newlywed couple's car, if that.
[See also James E. Crombie, "Shoe-throwing at Weddings", Folklore 6(3): 258-281, 1895, which cites the "time-honoured custom to throw an old show after anyone setting out on a journey to bring him luck", and quotes a couplet attributed to John Heywoods (1598):
And home againe hitherwards quicke as a bee,
Now for good luck, cast an old shoe after me.