Just built three new sites, how can I keep Penguin happy?

I just built three new sites. Loaded up my favorite plugins, did some nice on page SEO, submitted sitemaps and got indexed within a few hours.

Now I must admit, previously I would have moved on to directory submissions, social bookmarking, web 2.0's, wikis etc, but I really feel a bit nervous about doing that. I have a few newish sites built at the start of this year which are still out 1000+ in SERPS from being to heavy handed.

So far I have done little more then some manual on topic comment posts, other then that I am just to nervous to do much more. These are some very good niche's I have found and I don't want to fuck it up.

So what are the pro's doing now post penguin for new sites?

Diversify anchors, diversify link types, drip links steadily!