Beside cleaning recycle bin, CCleaner can clean and optimize unused files for freeing up valuable hard disk space. What we like the best is that it is free and can be portable and run from USB drive. It can clean temporary file from temporary folder and major internet browser, such as Internet Explorer, Firefox, Google Chrome and many more. Registry cleaner is also one of the major feature, although I seldom use. Not just cleaning, with it, our windows will be optimize and run faster. It also protect our privacy by cleaning histories and cookies in internet browsers. For us, it is a must utility tool in our computer. What do you think?