I'm surprised Macrumors doesn't post the Cnets AppleByte videos on it's page. It's a great, informative weekly video that's funny and I'm sure everyone will love.
Why are you surprised? That's like asking Burger King to advertise McDonald's french fries.
Both sites need to draw users to them in order to generate revenue.
They pull stuff from CNET, 9to5mac, Macworld, and plenty of other sites all the time for front page articles, and those sites pull stuff from MacRumors all the time too.