Xstatic,
Did you check out the link to the Winbond list? It is the second link at the start of this thread. I found that list in a google search that I did about a week ago. I am still trying to see just how accurate it is, but so far it has been pretty good.
Have you actually popped off the spreaders on KHX PC3500 and seen something other than BH-5, or are you going of hearsay? I'm not trying to be argumentative, just trying to verify the stuff on the list.
As far as not finding BH-5 at places other than e-bay, there's plenty of BH-5 still in stores, it just either pricey or no one knows what they've got. Check out the post by the fellow (swifty77) that got it as a substitute for some ordered PC3000 just within the last few days if you want an example of that. Heck, its even in some valueram. Granted, its not being manufactured anymore, but it didn't just disappear from the face of the earth the day after production stopped.