pg_dump problem

Using postgres 7.0.2, I am trying to dump my database for archiving the current setup and information that is in it.
(surprisethere huh?) and when I try: 

/usr/local/pgsql/bin/pg_dump -u dbname > /some_directory/dbname.dump

it wont work! It doesnt prompt me for username and passwd or anything, and still creates the dbname.dump file in the
specifieddirectory, but it has "0" size and I never return to prompt unless I hit Ctrl-C. If I leave off the redirect
andhave it print to STDOUT, no problems... 

I have done it as myself, as I read in the docs, since the database I am trying to dump has the same name as me, but it
stillwont work. I have tried to do it as root *and* as postgres - neither of those work either. What exactly am I doing
wronghere? 

Thanks


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