Pre-launch advice: How often do you remind people about your product's launch, and when you start?

If they have signed up for my email list, I treat them as a community involving them in the building experience right from Day one .So a weekly email which has share worthy content/update works. WIth respect to launch or social outreach, I keep it to one week before, one day before and the day of launch. People often forget since there are too many such requests coming up every day. Hard truth - if your product is performing well, people love to automatically join the wagon. So, when they visit the page and see your product first, they love supporting you a bit extra!