Ask HN: Where to promote digital downloads?

I'm using Gumroad to sell my first digital download product - a minimal dual timeline printable calendar.

There are lots of blogs out there that curate physical products, are there any for just digital products?

Should I still submit it for consideration to other sites even though it's a digital product? It seems that there's a big gap between clickbank type affiliate products and codecanyon/themeforest type downloads.

For those that have sold digital downloads, how did you market it?

Some product background, the dual-timeline calendar started a long while ago as a paper based trick I used to manage income/expenses as a student and also track fitness goals. It can be used as a couples calendar or to separate work & home, AM vs PM or even just as a single line journal upon waking & going to bed.

I really loved how it became a collection of data instead of a list of random tasks & reminders.

In the hacker spirit of things I decided to create a digital/printable version and use it as a learning experience for digital products.

It has done reasonably well so far selling to those that I validated the idea with. It seems to be of interest to those that like analog notetaking, bulletjournal or GTD method & typographic products. All suggestions really appreciated! I'll be writing up my learning experiences and moving onto larger projects in 2014.

Thanks!