zdgn - 12:59 pm on Nov 26, 2012 (gmt 0)
I can't be bothered to keep track, so I just block 'em
I stopped bothering about bots long time ago too.
There's just so much humanly possible to keep a track of in this increasingly 'social' web climate, especially with huge traffic turnover sites.
And Slurp is one of the well-behaved ones. There are JS-executing bad bots who don't actually announce themselves openly.
Not to mention armies of human scrapers employed specifically to spam by... ahem... "marketing" outfits. Try beating them.
The more you investigate, the deeper the rabbit hole goes and you end up doing 'just' that and not web development.
So in the end, I have cautious confidence in AdSense to be better equipped to filter them out, or else it's not worth the hype it deserves.