cdrecord does burn dvd's, this is the commandline I use to burn iso images to dvd:
Code:
/usr/bin/cdrecord -v speed=8 dev=1001,0,0 /path/to/iso
you may need root permission to use the cdrecord program. you may also need to change the dev='1001',0,0 to match your burner (as root, do 'cdrecord -scanbus')
man cdrecord