It would be useful to have an area where people could post if they knew of parts interchangeability between different bikes. For instance if searching for a part on ebay, you could broaden the search if you knew what other models used the same part. This does go on a lot, for example I know that the rear wheel between a Honda CB900C will interchange with that of a Honda Goldwing GL1100 (bikes from a former life). Whether each section could have a 'sticky' about this or some other arrangement like a major section on the front of the site is open to debate - probably a major section is the efficient way to go. My 2 pennies worth :-)