Rob Murch plays a 5-string, and he is outstanding in his style. Here's a pic: click.

as mentioned on Mark Bazeley's site,

"Rob plays a Paramount Style F and Clifford Essex Paragon 5-string banjos, and is one of the finest classic fingerstyle banjoists in the country. He's also adapted this style to suit the box playing of Mark and Jason to achieve his own unique sound. As one reviewer commented, 'a banjo is a happy instrument in Rob's hands!'"

There are links to reviews at the bottom of that page.

~ Becky in Tucson
who enjoyed the music in Massachusetts back in '00.