Marc,
I'm finding that the repl server in the source for Gambit REPL appears not to work. At least, when I try a telnet to an iOS device running Gambit REPL, the connection is refused. The same goes for my own app if I include the remote repl code, do a (start-repl-server), and try to telnet to the device.
It'd be mighty handy to have that repl server working.
--me