Forum sponsors by category?

[DarkBuddha]

Not quite sure where to post this, so mods, feel free to move it if it's in the wrong place. Anyway...

I realized I don't really know most of the sponsors here, but I'd like to support the sponsors that support the stuff I (we) dig. So I wonder if there is a listing of the sponsors based on product categories (i.e. tires, wheels, suspension components, engine components, race ware, safety ware, etc.)? I know that when I'm looking for something like who to buy tires from, I'm not going to spend the time to visit every sponsor to see who does and does not sell tires. I'd think a product category listing would benefit both forum members and the sponsors.