Violet Blue's SF Chronicle column this week, about YouTube's more porn-friendly cousins. Here's a snip from BoingBoing:

As content delivery evolves, porn, as an extension of human sexual expression, follows. The Flickr spin-off sites are a great example: Flickrchicks, Adult Flickr, FlickrBooty (all defunct) and several others made up for what Flicker's TOU couldn't, or wouldn't, deliver (yet appeared on the site, regardless). These sites essentially skimmed Flickr for hotties to repost in babelog-style form and pull in affiliate click-through revenue, many knowing full well that the pictures they link to have a limited life span.

Many businesses have flourished where others decidedly feared to tread, rather than creating a healthy, inclusive and lucrative business structure. Where Google's AdSense wouldn't go, AdBrite mopped up the revenue. And when PayPal decided that grown-up money was filthy lucre, a whole host of adult transaction services were eager to Dumpster-dive for PayPal's sizable leavings.

Similarly, early this year sites like (NSFW) HotTube.wordpress.com and (NSFW) DudeTube.blogspot.com sprang up in the tradition of the Flickr spin-off babe sites, making the most of YouTube's easily accessed user-submitted content and its inconceivably exponential growth rate. Simply sifting through YouTube for porn and coming up with the goods over and over again and then reposting the juicy finds was enough to make these sites merit repeat visits for viewers.