Some really interesting ideas here, I like the wiki idea. I've been coming to this site for a couple years at least and using the listings, and have submitted several but have only seen one or two of my submissions show up. Got contacted about one a couple months back (I forgot to list the number of holes in a hub weight) but that was it. I've got a pretty sizeable collection of weights dating back to the early 90s (anyone wanna know how much a pair of Modolo's wonderfully flimsy black plastic downtube shifters weigh?) and if there was an easy way to share that, I'd be all over it.
On the flipside, though, I worked in a position very similar to these listings and know it's VERY easy to get behind in this stuff and a hard, thankless job to keep up with. I'm never gonna fault anyone, and I know that it can be hard to let go, but man oh MAN I was happy when it wasn't my responsibility anymore!