aboard, about, above, according to, across, across from, after, against, along, alongside, alongside of, along with, amid, among, apart from, around, aside from, at, away from, back of, because of, before, behind, below, beneath, beside, besides, between, beyond, but, by, by means of, concerning, considering, despite.
There's a couple in there that aren't prepositions, specifically, but, concerning, and considering.
There are two schools of thought on punctuation, which we can call grammatical and rhetorical. The rhetorical uses commas to indicate pauses in speech and the grammatical uses them to say things about the relationship of words to each other in a sentence. A classic example of the difference might be seen in the phrase my wife Mary and I. The rhetorical punctuator would leave that phrase unsullied by any commas, but the grammatical punctuator would sneer at the suggestion that the speaker had another wife lurking in the wings somewhere, preferring to punctuate it my wife, Mary, and I.
