It's listed in a few directories, and I still get a few visitors from the likes of KillerStartups (featured it back in March), but other than that I don't really know where to begin :)
Oh! I added an affiliate programme about a month ago and submitted that to various directories, and have had about ten users sign up for it, leading to zero sales.
Honestly, I think the product itself is good and enough people seem to want to pay for it - I'm just not sure what the next steps should be. I'm deliberately not mentioning the site as I want this question to not be specifically about me, but if you have any tips I'd love to hear them! :)