Just to let you know I've had to delete a wave of comments which were just spam left by casinos and gaming website. As it is time-consuming I've added a step where you have to type some "capcha" to be able to comment. If it doesn't deter future spammers, I will have to let only registered users to comment. Sorry.
As for the real Spam/Google Adsense stuff it's back temporarily, but if it doesn't bring in any money on the future (unlikely, people have to click on them for me to make $$$$) I'll disable it again.