Not sure, to be honest. I'm trying to make a point of not looking at the numbers (and the chart ranks..!) until the month end. You can actually end up obsessing about that sort of thing and that's not entirely healthy
I glanced at the stats and the second book has already done over 100 copies on Amazon UK, but that was when I looked a few days again. Right now, it's in the top 700. Hopefully, it'll climb higher over the weeks. It's only been out since last Sunday.
There are two editions of the first book. The first edition is free on Amazon and iBookstore and has been in the top 100 free books on Amazon UK for several weeks now. On the iBookstore, it's received over 180 ratings (average 4.5 / 5).
Anyways, this is off topic.
Back on topic: I agree with some of what is in the Guardian article and other things I don't. I think that e-publishing is going to simply become a more viable option for those wishing to get their work out there and make money from it. For those who want to do it properly, getting an agent and a publisher is still very important and will always be.
After all, you'll be working with professionals, who can also deal with things such as foreign rights and translations. I've had a few people say to me about my books that they find phrases such as "whilst" instead of "while" and the fact that "honour" is spelt with a U a bit odd. Foreign rights handling with deal with issues such as this.