And what is this strategy?
I'm a "beginning writer" and feel as if I'm drowned in books I feel I should read.
Generally, if you are reading, you have a specific interest in the difficulty/target audience of what you read. Mine is literary works, and I prefer stories with as little plot as possible, and more on the challenging side. To obtain this result, I flip through online catalogs and read literary reviews online, in addition to criticism provided by certain academic institutions. That way, I have accumulated a large list of what I feel necessary to read, and will conquer that before actually leafing through book stores.
Personal recommendations seem to be the best form of determining what to read, yet even then you need to trust who is giving them (something I find hard to do with most readers). Instead I try to see which authors the author of books like, and that way branching off.
Of course, that method works best for novels, but poetry is a whole other beast that requires a good detective eye, since most book stores don't carry what I am looking for. I guess for that I am lucky I know the right people. This list however is probably the best foundational list for all genres ever constructed (though still imperfect)
http://www.interleaves.org/~rteeter/grtbloom.html
Though for book covers, generally a impressionist or post-impressionist painting on the cover seems great (renaissance paintings on the cover usually allude to some historical romance). A real photograph as well makes a great cover, but a painting, especially an elaborate one, or a cover containing clusters of symbols and wheels and whatnot, as are made popular in the fantasy and thriller genres, seems to be a turnoff.