Autonumbering Problem?

Hi,

I'm used to MS Access handling the autonumbering all by itself.  I'm not
sure if this issue is common knowledge for both PostGres and MySQL, but
perhaps the reason for my error message has to do with a badly formed
SQL statement.  Here is the output seen in my terminal window:

[arthur@arthur ~]$ psql tco
Welcome to psql 8.1.4, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms
       \h for help with SQL commands
       \? for help with psql commands
       \g or terminate with semicolon to execute query
       \q to quit

tco=# insert into customers (FullName) values ('Arthur E. Baldwin');
ERROR:  relation "customers" does not exist
tco=# \d
                 List of relations
 Schema |         Name         |   Type   | Owner
--------+----------------------+----------+--------
 public | Customers            | table    | arthur
 public | Customers_CustID_seq | sequence | arthur
(2 rows)

tco=#

What am I doing wrong?