can't create user collumn

Hi,
i'm just starting with postgres DB, but this looks very strange to me:

If i try to create table with collumn user, it fails with error:
create exec error:ERROR: syntax error at or near "user" at character 368

query:
CREATE TABLE Log (
log_date date NOT NULL,
log_time time NOT NULL,
timezone int NOT NULL default 60 ,
dest varchar(20) NOT NULL default 'messages',
hostname varchar(100) NOT NULL default 'localhost',
source varchar(20) NOT NULL default 'db_speed',
pid numeric(10) NOT NULL default 0 ,
category int NOT NULL default 10 ,
priority int NOT NULL default 10 ,
user int NOT NULL default 0 ,
log varchar(800) NOT NULL
);

But if I change the collumn name to "usr" (just this, nothing else), it
is o.k. and the table is created.

The question is, if I omit something, or it is a 'feature' of postgres,
or if it is a bug?

Thanks

Jiri Zouhar

p.s. I have postgres (PostgreSQL) 8.0.7, RH FC4 build