I do not have much knowledge about link building tips, however i share some point which i know from my understanding: Avoid private blog, Avoid the loophole chasing, Avoid over optimize on site and off site
Hi, I think make blog as much you can. penguin is all about spamming. try to write fresh content for article and blog too.
Yea these are pretty good tips, although I'm not sure what you mean by "private blog". But anyways as far as link building, not that much has changed from my experience...as long as you're building links manually and naturally, from a variety of sources, you'll be golden