security question

Hi,

I have a quick question about my installation that puzzles me. pgsql 8.2.3 on a debian box. Tested it out the database works. pgadmin III connects fine too. I used alter table on the template1 database to give postgres user a password. I changed pg_hba to use md5 on all connections including local.

When I use psql -U postgres -d myDataBase to connect to myDataBase I do not get prompted for a password? When I su postgres and use psql myDatabase I get prompted for my password?

Is there some reason why I can login using psql to a database when postgres is supposed to use passwords for all access?

Probably a mistake I made somewhere along the line... just not sure where, usually I get my pgsql install working great!

Thanks

Dave