I have been out of the building a SaaS game for a bit and now working on a new side project (I can post what it is if anyone wants to know, but didn't want to self promote off the bat).

I remember a few years ago, a beta list(from the likes of BetaList, BetaPage, etc) was hugely valuable and signups seemed to flow in quickly and easily. Does anyone still build beta lists? Find/found success? Stories around that?