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Kennaugh and Puccio have both done well too, having joined as neo-pros.
But Josh Edmondson is an obvious example, but he was, by his own admission, an disaster area when it came to organisation, and he's disappeared without trace since leaving Sky. Dombrowski had injury problems for most of his time there, and struggled with positioning on narrow, European roads. He looks like he's found a better environment at Slipstream though.
One thing I'd say about Sky is that they seem to get the best out of most people, i.e. it's rare that riders leave the team, especially younger ones, who then go on to better things. Alex Dowsett is the only example I can think of without trawling through http://www.procyclingstats.com .
Is there? I'm not sure they are as bad as people make out, just look at how well Luke Rowe and Ian Boswell have done there. But then they aren't a development team, their goal in pretty much every race they enter is to win, so it's a tough environment for a neo-pro, who'll probably end up riding on the front for hours before television coverage begins and rarely getting a chance to shine.