Thanks, all for the response. The consensus seems to be that master links are OK and I agree. Larry Strung points out that motorcycles use master links and I have never seen one of those fail.
There is a conflicting opinion that master links are not as strong as chain links and are, therefore, not appropriate on a fixed gear/track bike. Several of my riding buddies feel this way but I know the only chains I've ever broken are those which I have taken apart and put back together without a master link.
Pete, thanks for that link to the fixed gear list. Sheldon has quite a fixed gear section on his web site, as well. Try, also, http://www.peak.org/
Rick Chasteen