I'll most likely come back and edit this message as I think of more and more motorcycle products that I could just not live without... Some practical, others just good to have...
But let me start and say...
Bungie cords and Bungie nets! - Indispensable items for carrying everyone on back of your motorcycle!! I've used them to carry rainsuits, lunch, toys (for toy runs), groceries and much more!
Lemon Pledge - That's right, the furnature polish! I don't know what my motorcycle plastic would do without it! I also use it on my helmet's visor! I've used a lot of products in the past to clean plastic with, but Pledge just does it best! Did you know Kawasaki uses it on their new show bikes to give them that beautiful look?
Mother's/Meguires Polish/Wax - I couldn't live with my bike if I could not polish and wax it to looks its best! Argh, what would I do without the stuff? I really enjoy using Mother's and Meguires Waxes and Polishes on my motorcycle, it works great for me!