Though people are always curious of knowing the plugin other successful blogs are using. One of the simplest way to know the plugin which any blog is using is to ask the webmaster of the blog. Sometime you might get a nice reply along with the list of plugins else you can use the simple Google trick to find the plugins any wordpress blog is using.
Though this trick will not work who have optimized his blog well by blocking his wp-content folder with robots.txt or any other method. You can read my previous article on robots.txt to block bots to crawl your admin folder.
Simple search Google with this search query :
Make sure you replace xxxx with the blog name.
Though it will not word with all the blog but will be helpful in many cases.
So what are you waiting for, try this trick to find the plugin major blogs are using. If you like the trick you can help us with a stumble upon here.
Meanwhile which plugin you are using?