If you are using removable disk or USB key then you should look at this lesson. I will show you how you can safely remove your device from computer without the fear of losing data.
With the new version of Photoshop, you also get a new cropping tool called Perspective Crop Tool which will change the perspective on a image. Check it out, it really is a cool tool.
Dropbox is an amazing cloud based web service enabling you to store your stuff like pictures and documents and access them from any device with an Internet connection. Plus you can share the stored items with others.