The guys at TechTreak.com have made a list of the The Best 35 Most Popular Wordpress Plugins which are really help full for bloggers to boost your wordpress blogs right from traffic, content, feeds, comments, ajax, make money, sitemaps and more.
Check out the most popular wordpress plugins below:

Get Recent Comments – This plugin displays excerpts of the latest comments or trackbacks of your posts in your sidebar. You will have a comprehensive control on how they appear. It ranges from the number of comments, to the length of the …

Here is the math behind the major social networks, the formulas worked down from analyzing their inner mechanisms and just exactly how a submission gets a “popular” status. Hopefully, these social networking statistics will provide some insight into how they work, and which ones might be easier to manipulate for your particular niche.
Social Network: Digg
Digg takes, on average, 60 – 300 “Diggs” to become popular, and you can expect to receive around 10,000 to 100,000 unique visitors if your story makes the Digg homepage.
Social Network: StumbleUpon
StumbleUpon submissions take about 30 …