Depends on which band it is. If it's a band I like I don't really care what the album cover looks like (some of My Dying Bride covers have been a bit poo). However, I have gotten into Bal Sagoth purely from the cover of Starfire Burns; and Drudkh through Blood in the Wells album cover. So in a way, album covers do matter.
The live record is probably Decade of Aggression. I haven't listened to too much recent Slayer to be honest but World Painted Red is good. Seasons in the Abyss is my favourite and Divine Intervention is always high on my play list.
I recently acquired some interesting movies. "Kolberg" is a German movie released in 1945. Think about that, within a few months of totally losing the war, they were still making, distributing, and showing new movies in the handful of remaining theaters. Not only that, they diverted hundreds of troops to serve as extras in this movie, and used sh*t loads of real ammunition to bombard a replica of the town. All this when they knew they would loose the war. As for the film, most of it was rather bland. There was much dialog about never surrendering, and your material defeat is a symbolic, moral victory, or something like that, I guess. But, I must say, the end of the movie, when the town is bombarded, is a pretty good payoff, after the earlier dullness. All that aside, it's worth watching just because it's in Agfa Colour, an early German coloring process that produced vivid colors that make everything look like a fairy tale book.
The other movie was "Stosstrupp 1917" a German movie released in 1934. It's B&W, but the copy I have has a very clean, clear picture. The film pretty much glorifies war (WWI), while simultaneously showing the horrors of war, if you can rap your head around that. It was fun to watch, a lot more interesting than "Kolberg," because it was fast paced and full of action. Again, real ammunition was used in the battles, and for most of the movie you can hear bombs falling and exploding, usually in the distance, but often enough close by. Of the two, I would recommend "Stosstrupp 1917," if weird old propaganda movies is your thing.