New set of free books from Vook are now up for UK Kindlers. Should be free in the US around 3am. Full listing will follow, but, for now, this search
will find them in the US/Main store, while this one
is for the UK store. Note that due to the time shift, both searches are currently turning up about 60 books - half are free in US right now and not the UK; the list should settle down by tomorrow to only show the new freebies.