The Center For Expository Bible Preaching states that an "alliterated sermon is easier to read, preach and listen to." Says who? (besides them of course) But what authority says this? Some professor of preaching? He didn't ask me. I find it not easier, but annoying and cloying to listen to "an alliterated sermon". Give us a break. Alliteration, like chocolate, should be for special occasions rather than a steady diet!
At least some scholars are getting on the right page. David Allen, professor of preaching at Southwestern Seminary, writes, "I am not a fan of using alliteration in outlines very much these days."