Google PageRank Update and you got lower rank
It's kinda old news but just want a discussion on Google de-ranking many sites out there. The above link lets has a link to many different articles and comments from top bloggers and it's interesting to note what are the new things 'not to do'.
Text link resellers like Text Link Ads beware.
Blog Network Interlinking
Try to also keep the number of links in the page to be less than 100
Seems that Google's algorithm is getting stricter/smarter and the best that we all can do is to adapt. No use complaining or venting (unless you're popping a vein in your brain) and just go with the flow. Google can do whatever they like. The message is clear and sent, so now you know.