matrix query?

this is probably a more generic SQL question than a postgres specific one, but:

CREATE TABLE data
(
customer varchar(10),
widgets int,
day int
);

INSERT INTO DATA values('CustA', 5, 1);
INSERT INTO DATA values('CustA', 4, 2);
INSERT INTO DATA values('CustA', 9, 3);
INSERT INTO DATA values('CustB', 8, 1);
INSERT INTO DATA values('CustB', 3, 2);
INSERT INTO DATA values('CustB', 1, 3);
INSERT INTO DATA values('CustB', 1, 3);
INSERT INTO DATA values('CustC', 2, 1);
INSERT INTO DATA values('CustC', 2, 1);
INSERT INTO DATA values('CustC', 7, 2);
INSERT INTO DATA values('CustC', 1, 3);

what kind of select can i do to get:

Day CustA CustB CustC
1 5 8 4
2 4 3 7
3 9 2 1

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[ Jim Mercer jim(at)reptiles(dot)org +1 416 410-5633 ]
[ I want to live forever, or die trying. ]