Since upgrading to Snow Leopard I have noticed that Mac Ports (Previously called Darwin Ports) started giving me lots of errors. So I manually downloaded and installed the latest version, from here.
I then had to run through the insructions here  to clean every thing up:
$ port installed > myports.txt
$ sudo port clean all
$ sudo port -f uninstall installed
The look through myports.txt and install any you need.
$ sudo port install fping scite