Try the timed-release formula. It works for some people -- they don't have the flushing. However, a couple of people I know said that the flush lasts a longer time, although not as severe.
This post reminded me that I had the stuff, and that I ought to be taking it. I'm up to 1000 mg right now, and the flushing is nothing like what it used to be.
That's enough Niacin for tonight I think- time to lie down and read some Patrick O'Brian. :-)