I'm curious what visual aides you use in your game. Do you go out of your way to provide visual aides? Do you find they help? If you do go for visual aides, how much and how far do you go?
Do you use battle mats for combat? If so, do your PCs have custom miniatures, generic miniatures, or are you fine with just representing them with a pretty stone or other marker?
Do you have pictures for key NPCs? Do you have pictures for special weapons? Locations? Do you reference locations that your players may or may not know when describing locations?
In general I'm fairly light on visual aides, but it's something I've been toying with. In my D&D game I use a battle mat for some combats, but the PCs don't have special minis and I tend to use starbursts for enemies - this way my players can eat what they kill which basically rewards them for being murder hobos.
I don't tend to use pictures for NPCs - unless that is how the NPC started or one just falls into my lap. I do use them for my characters when I'm a player quite frequently though.
Beyond that, I'm pretty light on visual aides. It's a new thing in my D&D game that I have maps for the world. It's a fun thing to play with though, and something I may do more with.
What about you?