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I'm somewhat new to SEO, but from what I understand, slow link growth can provide better results than highly aggressive link building campaigns. A site of mine was recently featured on a 90+ DA (55 PA) blog directory, and was featured for the entire state, therefore I received almost 20,000 inbound links from the site (from every company/listing in the state). The links have been mostly recorded (17,000) in Google webmaster tools (Yahoo Site Explorer claims around 23,000). However the site dropped 2 pages in rankings for numerous SEO related keywords since webmaster tools listed the links. Many of them are PA 50+, though a majority of the linking pages are PA 1. A few other inbound links were created from other root domains, roughly 8-10 or so in the past month. The question is, would a large amount of links like this all of a sudden trigger some kind of "penalty" from search engines (Google, especially)? And, do the PA 1 pages take away from the quality of the 55 PA links?