The traffic of this weblog

I just had a look at the traffic figures to this weblog over April and I'm stunned. I knew already that traffic was going up but I have never seen it grow that fast. There are huge differences though in the different ways people read this blog.
The number of RSS-readers has been rather stable, slightly under 2,000. The number of visitors on the other hand went up 20 percent, to almost 60,000 visitors, compared with March. The biggest jump is in the number of unique visitors that went up 50 percent, to almost 30,000, compared with March. Compared with February the jump is even more remarkable and more than doubled.
That probably means that the number of incidental readers goes up faster than the number of regular readers. Search engines seem to have an easier job in finding this weblog, and I see that the number of this for specific articles (yes, porn and sex are doing pretty well, thank you) has been climbing rather fast. That might be due to the revamp of the lay-out of the China Herald, but could also independently mean that the search engines are getting better.