Maybe it's because I am not signed in, but it looks like you are missing a lot of the tools needed to spot sockpuppets / shills, like history of votes / edits for a user, and list or voters for each answer.
If your site gets popular you will be flooded with astroturfers and over-enthusiastic project promoters.
Regarding sockpuppet accounts and the like, we do have that information - some of it will get more visible as we build out profiles and moderator tools, it's just been on hold while we focus on more user-facing features, since it hasn't been an issue yet. Account validation e-mails are also on the way.
Spam is definitely a concern, but we hope the fact that most content requires acceptance from another user before getting visibility will put up some barrier to entry, and in the cases where it's not sufficient, it should help us get some information on associated accounts. In cases where that fails, there's always manual moderation.
Regarding astroturfing, we welcome it, to some degree - we don't expect each viewpoint to maintain NPOV, we just want to make sure that each viewpoint gets visibility. Cons/criticisms will eventually broken out into a separate feature to reflect this.
We are recording all that information and have put a lot of thought into how to combat those problems. Unfortunately they didn't make it in for the Alpha, but its definitely something we are aware of and are actively working on.
If your site gets popular you will be flooded with astroturfers and over-enthusiastic project promoters.