Concat All Col2 Values For Each Col1, And Add Sum(col3) (was Query Help)

Hi,
Can anybody help me to create a single query? I have this problem.


CREATE TABLE t1 (
col1 VARCHAR(100)
, col2 VARCHAR(100)
, col3 INT)

INSERT INTO t1 VALUES('A001','Tom',30)
INSERT INTO t1 VALUES('A001','Rick',40)
INSERT INTO t1 VALUES('A001','Harry',10)

INSERT INTO t1 VALUES('A002','Peter',50)
INSERT INTO t1 VALUES('A002','Sam',50)

INSERT INTO t1 VALUES('A003','Fred',50)


I want a resultset like this ...
i.e col1 col2(all the values would be represented in a single row for each col1) and sum(col3)

(Note: There can be maximum three records for each col1 record,i.e for A001 there can be maximum three records)


A001 Tom Rick Harry 80 --sum(col3)
A002 Peter Sam NULL 100
A003 Fred NULL NULL 50


Any help would be greatly appreciated !!