One of the areas I have been focusing on including are Japanese prototype items. I have been entering passenger sets, buildings, vehicles, and figures.
Click HERE to link to the N Scale database.
This database is well worth checking out. Points can be earned for entering items and then can be exchanged for a variety of N scale items or for subscriptions to N Scale Magazine or membership in the N Scale Enthusiast organization.
I personally have found the database helpful on several occasions when doing research. When calling up a particular item in the database, it will indicate if that item is available for sale on ebay or Amazon with links to the listings. The database itself also has items for sale on this database at reasonable prices.