SQL & PL/SQL :: Merging Text For Same ID

I understand you can do this using cursors, but i need it in plain SQL; so that I can make this a correlated sub-query to another table using the id column.

Here's the original table:

id subid text
-- ----- ----
1 1 red
1 2 blue
1 3 green
2 1 yellow
2 2 black
2 3 orange

result should be:

id text
-- ----
1 red,blue,green
2 yellow,black,orange

SQL to Create and populate the table:

CREATE TABLE testStringJoin(ID number, subid number,text varchar2(50));
INSERT INTO testStringJoin values(1,1,'red');
INSERT INTO testStringJoin values(1,2,'blue');
INSERT INTO testStringJoin values(1,3,'green');
INSERT INTO testStringJoin values(2,1,'yellow');
INSERT INTO testStringJoin values(2,2,'black');
INSERT INTO testStringJoin values(2,3,'orange');