I use Opera 5/Mac as my main browser, and ever since Google started their new AdSense program, I've not been able to load any page with a 468x60 AdSense banner completely... which means I now have to open a different browser to read The Register. :(
The 468x60 banner displays with visible scrollbars like a badly-implemented iFrame, and everything after that on the page fails to load at all... which seems like kind of a major bug for a program like that. (Tho' I suppose it might increase ad clickthroughs if there's no other content on the page, hehehe. ;) )
OK, maybe only 5 people on earth are using Opera 5/Mac, but still... it displays 99% of everything perfectly well, so I wonder what's the problem here?