Based on my experience digixmas directory submitter can be an useful tool, although you should not rely only on this, you should use other link building techniques too. I think if you create an unpaid profile for your site, only 150 zero PR link directories will be accessible, and this amount of directories adds way too little link juice to your site, so you should go for a paid option with more than two thousand directories at your disposal. Anyway I have recently summarized my experiences about digixmas here: directoryofdirectoriesofdirectories.com/my-experience-with-digixmas-directory-submitter
And based on my experience digixmas is pure bullshit. Zero results, ZERO. Save your time and build some real backlinks instead.
Hey this is not a really useful contribution to the discussion It would be useful to know, what kind of keywords have you targeted, how many directories you submitted that site a week, how many title/description combination used and finally what were your expectations...