You don't need Photoshop or some other advanced piece of software to resize a large number of images at once. You can use Microsoft Office Picture Manager which is part of the Office suite.
CSS is a mighty powerful language for shaping your web objects. You will learn to create a two versions of a web button, one with and other without a transition.
Gmail offers you a new way of organizing your emails in tabs. You have a tab for you personal conversations, a tab for social media related emails, promotional emails with offers and a couple of more tabs.
Samsung Kies is a program for transfering files between your Samsung mobile device and computer, syncronizing your Outlook contacts and tasks and much more.
If you are a heavy twitter use, possibly with more then one account, than I suggest you to give Tweetdeck a try. You can arrange, schedule, monitor and manage your tweets with ease.