If you don't have installed program for editing PDF documents on your computer, then you can use web application PDFescape which allows you to edit your documents in your browser.
If you are mostly using only one resample image option when resizing images, then you can change the default option to the option you are using the most.
If you find yourself in a situation when you need to list your Mac specs or you just want know if you really got what you paid for, this is how you find them out.
Pretty useful trick in Adobe Photoshop, where we will change the setting for showing dimensions in pixels instead of centimetres while making selections.
