How about a wiki, since there's so much trivia that's hard to keep track of. For those who don't know what a wiki is, think of an encyclopedia that everyone can contribute to, and each page has a discussion page to it so people can collaborate with new info, debate, etc.
So, for instance, if I wanted to know what years the Westerner was produced, I could type it into the wiki search instead of trying to search the forum or ask in the forums when I'm sure it's been discussed *somewhere* before.
You could search the wiki for Weber part numbers to see references such as 'this was discontinued and replaced with this part number, which introduced this improvement' or restoration subjects like grate rust removal methods.
This would be especially awesome for the rare stuff, like the Wishing Well or Barrel Bar-B-Q.
Sent via smoke signals from my Weber kettle