MP3::Tag supports arbitrary ID3v2 frames.

MP3::Info and MP3::Album only support a small subset of frames, and not the Attached Picture (APIC) where album art is supposed to go.

You want to do something like:

use MP3::Tag;

$mp3 = MP3::Tag->new($ARGV[0]);

$mp3->get_tags();
$id3v2 = $mp3->{ID3v2} if exists $mp3->{ID3v2};

$id3v2->remove_frame("APIC");
$id3v2->write_tag();

$mp3->close();
[download]

Just feed that script a filename, and it should remove the album art (assuming your ripper actually put the album art in the right tag).

Of course this is just an example, and if it breaks something you get to keep all the pieces.