What is the best angle to store beer bottles? Currently I am storing my bottles in the crates at a (about) 20 degree angle (bottles are upwards!).

Does the way of storing the bottles affect something (and how)?
In general, you just want to store your beer bottles standing upright. For tons of detail on bottle storage, BeerAdvocate has a great guide, but in short: storing a standard shaped beer bottle upright minimizes the surface area exposed to air in the bottle, slowing oxidation, and preventing spoilage. Additionally, in the case of unfiltered or bottle conditioned beers, it's highly desirable that any yeast settle at the bottom of the bottle - and not anywhere else.