irfanview for images, vlc for videos, foobar for audio - so much better than anything bundled with windows since forever
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wasd for games, ctrl+shift+qewasd for play/pause/forward/backward/next/prev and so on. Don't need to switch window, don't need to move hand away from wasd. Can't live without it now even though I don't have so much playtime any more. Works just as well in any other environment.
Even works as a portable app.