I've noticed...

I've noticed that there is some orange ad that appears sometimes when I hover over the top banner. Is this from adsense? It looks similar, and was this just added? It caught my attention so I clicked it lol. I think it may be a good spot to have an add just pop up when you hover over it :P

Oh I've just noticed that it says Clicksor above the ad. I have never used them before, are they just as good or better than Adsense?

I can't say that clicksor is better than adsense, but as you mentioned these ads are contextual.

That means that their code automatically converts the text of the page into ads (if ofcourse there are any relative ads)

You can check this thread here about this company : http://webmasterforum.thetopsites.net/index.php/topic,75.0.html