Messy Lenses

There’s a fine art to adding sales modules to lenses. The worst way is to intersperse them throughout the page in a haphazard manner—obviously not there for the reader’s enjoyment of the page but to sell something. Hopefully.
From the eyes of this consumer, I’d be more happy with someone’s recommendations if they were placed in a way that tells me that I’m about to see what’s in the marketplace for items related to the lens.
Why not add all Amazon Spotlight books to a labeled section—Best Books About Such-And-Such, for example? The haphazard method is confusing. I may note it with interest, but I read on because I’m interested in what is being talked about before I was interrupted with the sales module. However, by the time I’m at the end of the page, I may not be interested anymore in hunting down that mentioned book.
There are ways, yes, to intersperse modules throughout a lens, but if there’s not enough attention paid to the order of things, it can only backfire.
What’s your opinion? Any tips on module placement? How about ways to introduce what you are about to recommend?
