@ Eugene - In the cycling world it is widely accepted that when a manufacturer releases new gear (especially a bike frame) they give the weight of the smallest frame usually bare meaning no paint or protective lacquer. Footware and size specific objects can be put on the list as long as you mention the size you have measured. Custom gear would be under the 'custom/homade equipment' section.
No doubt that camping equipment lists would be a harder project to set up but the stock standard stuff like shelters, sleeping mats, sleeping bags, back packs, walking poles, water purification equipment, utensils (knives, lighter, flint, spoon/fork/spork, multi tools), rain jacket/pants, gps units, whistle, compass, stuff sacks, water bladders....just off the top of my head could be put into a spreadsheet with weights. For begginers it's a great way of comparing gear. For experienced guys and gals not so I guess (just like in the bike website).
And the rest is all on this forum, how to lighten your equipment.