You should link your sites, but do it with some common sense - you should try to make it look natural.
Well, Linking between the two blogs is okay for the Adsense but its not okay for the Panda (A Google Update). High back-links to the outer blog or site may lead to down your ranking on Google Search and this will also affect badly to your Adsense earning. So, I say don't link blindly. Just link it properly and make it some of the place as no-follow. Or Give the backlink to the other of your blog at the footer of the site. Thanks.. Happy Friendism
link blinkly and don't care about anything you read elsewhere, those people know nothing about anything, they don't work at google in the algorithm department, so they rely ONLY on hearsay and mental masturbation on seo forums. Just walk your own road and you'll see, google will follow you or not, but don't suck his toes, you don't have to, just do like you want and up to google to do its job or not, don't let others mess up with your head, enslaving yourself is not the way it works.