help with installing darwinports

Hi there
Excuse the luddite question, but I'm having some problems installing
Darwinports and getting it running - I was hoping someone could tell me
where I'm going wrong, as I'm following instructions to the letter but am
getting nowhere.

I've tried the binary installer and compiling the source.  Both of these
tasks appear to work.

However, after editing my .profile file to make sure the path is included,
(and restarting a new terminal) I still get an error saying command not
found.
McMac:~ david$ port
-bash: port: command not found

My profile is:
# Your previous .profile  (if any) is saved as .profile.dpsaved
# Setting the path for DarwinPorts.
export PATH=/opt/local/bin:$PATH

Anyone got any ideas what's going wrong?

Thanks