Besides Zinn, you might look at Spectrum Cycles if it is in your neck of the woods. Not sure what you want to spend but they make great frames. In their gallery they have a pic of a tall bike with an older gentleman. I used to have a 28" Panansonic years ago so they are out there.
http://www.spectrum-cycles.com/index.htm
http://www.spectrum-cycles.com/image...0Pages/p58.htm