I'm not concerned with grabbing everything you own via Steam(i.e. connecting your user ID here, even though that is doable). I'm moreover thinking that when you do a search(Much like in WiiTDB, as it could be), you would search for the name, and if it didn't find a result for the matching console(specifically Steam or the Wii in this case), it would show secondary results as searched on Steam specifically, or on WiiTDB specifically. At that point, it would autofill as much data as exists on those databases for the game in question, which can be corrected by the user before clicking "Submit".