It's free information. If they want to present it as a slideshow and put an ad or 2 here and there, shouldn't they be able to? I've gotten some useful information from these; I can't complain about their presentation. The ones I can't stand are the free downloads or trialware where they get your email address or worse yet your phone number (I've learned my lesson). They will pester the living hell out of you to get you to buy something you probably don't need... a perfect example is SolarWinds. Not bad software, but I downloaded a free TFTP server app once - and I got bombarded by their sales team for months to try and sell me a suite of monitoring tools priced in the thousands.