$ perl mp3_to_s3.pl
File Checksum: 6c4b039e682eb2ae9916e0858f5175a5
(Entry inserted in)

demo=# select id, md5_checksum from mp3_amazon;
 id |                        md5_checksum
----+------------------------------------------------------------
 43 | \324\035\214\331\217\000\262\004\351\200\011\230\354\370B~
(1 row)

demo=# select id,encode(md5_checksum,'hex') from mp3_amazon;
 id |              encode
----+----------------------------------
 43 | d41d8cd98f00b204e9800998ecf8427e
(1 row)