Internet Explorer( ver. IE8)- Even though there is newly added color-coded tab system, new exclusive security features & private browsing but it is quite the underdog. Speed is very slow and pages take a lot time to open. It is the least preferable of all the browsers. The lack of a download manager & robust extension ecosystem hold the browser back. But it has good integration guidance i.e. it can be integrated with software's like-Bitcomet, Download managers etc. Also you can keep the browsing private if you like.
Opera(ver. Opera10)- It is a very stable browser, no crashes. Also it comes loaded with a very good pop-up blocker. It has a new speed dial feature which is similar to favorites toolbar but gets displayed in the new tab option.....But the speed is very slow....Also it cant be integrated with other softwares. Also there is a new feature Opera Turbo which is awesome. It allows you to browse in even very little speed. it will open those pages which all other browsers cant open due to inadequate speed. Widgets is also a new exiting feature and the download manager also works fine. But it doesn't have any private browsing mode
FireFox(ver. FireFox3.5)- Though it is better in speed than the above two but the pop-up blocker doesn't work at all. There r a lot of plugins available for making the browsing interactive. These can be a lot of customization to make the browsing more private. tabs are good and the integration also works very well. But the speed is slower when compared to Chrome. Smart Location bar is also a very helpful feature. But overall it is a good and reliable web browser.
Google Chrome(ver. chrome4.0)- Its is surely the fastest browser in town. With unmatched speed and blazing site browsing it has a very good download manager. It amongst all the other browsers is the lightest. Uses very little memory. Google has given the word a solution to the web browsing problems. The InCognito feature enables you to browse privately and no history records r made. But it is still in Beta mode so it might crash often but it has a crash manager which restores the pages in case of a crash. Third party downloads r still little less. But it has lots of skins which can be used to give a very pretty look to the browser. It has all the features which a person need for browsing. Chrome lives upto its hype.