Find what’s good for your website with Google Website Optimizer
Everybody do change their site layout, color, change pictures, etc for better usability, better look and to even increase their earnings. But it always difficult to track which change performs better and which change attracts more visitors for the different versions of your site. For that Google gives you a free tool called Google Website Optimizer where you can test your changes and the tool will automatically show you how many visitors have been attracted by different versions of your site.
Skype is one of the most popular free software which is used across the world to do free calls, video calls and instant messaging over the internet. But there are not much free web-based services available to access your Skype account online like what we have for other instant messenger and chat services AIM, Yahoo!, MSN, Google Talk and Gmail, MySpace IM, Facebook Chat. 
How do you know if somebody copies your content and post in on their blog or website? Its always difficult to trace every time with millions of blog out there in the Internet. How about a service which can tell you whenever something is copied from your site ? Good doesn’t it? 
Everybody is curious and wants to know about how a website or blog is worth in money and one can find lot of sites which do this job wonderfully. 
Regular expressions are generally used to to search and manipulate text based on patterns and are widely used in programming languages, text-editors. Regular expressions are very powerful and there are not much interactive online applications or tools to learn easily in real-time. 