It's highly recommended to protect your computer against Virus, Malware, Spyware and other potential threats. Microsoft Security Essentials is one of the better, free solutions.
Dreevoo Content Image Maker is an awesome little stand-alone Windows app that will help you create images for Dreevoo.com tutorials. Remember, you get paid for every published tutorial.
FTP is a file transfer protocol for exchanging and manipulating files over computer network. We will use FileZilla software to build our own FTP server that actually works.
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.
If you want to put your video files online using HTML5 then it's recommended to have three different formats for a full browser support. Those formats are mp4, ogv and webm.
