A while back I closed comments to registered users (registration was free and open), and all comments were moderated. The reason for that was that I was at that time flooded with insane teens from Fark.com and wanted to have the chance to filter out hate and stupidity.
I'm reopening the comments for a while, policy may change again if needed.
Feel free to post questions to me in the comments, I'll try to collect them and answer in a few days...
P.S. apparently blogger will have an outage at 4PM PST. Hopefully not for long.