In know there's already a Twitter feed, and an RSS feed on Vyrso free books, but since I'm using neither on a regular basis (I'm still in the stone age, mainly using email...) I've created a script checking the Vyrso website every 60 minutes, and sending out all new free books by email. So it sends out emails no later than 60 minutes after initial release of new freebies.
You can sign up to the newsletter here: http://www.heidoc.net/joomla/bible-apps/vyrso-freebies
Blessings,
Jan