Generating table rows from arrays

Is there a convenient way to turn an array into table rows?  For
example, I've got an array like {1, 2, 3} and would like to insert
rows:
 ('aaa', 1) ('aaa', 2) ('aaa', 3)

The first row is constant.  I could write a loop with PL/pgsql, I
guess, but I wonder if there are better options nowadays.

--
Florian Weimer                <fweimer@bfk.de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstraße 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99